Imperial College London

ProfessorDavidBrooks

Faculty of MedicineDepartment of Brain Sciences

Visiting Professor
 
 
 
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Contact

 

david.brooks

 
 
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Assistant

 

Ms Hyacinth Henry +44 (0)20 3313 3172

 
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Location

 

U106Block B Hammersmith HospitalHammersmith Campus

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Summary

 

Publications

Publication Type
Year
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1039 results found

Juul-Madsen K, Parbo P, Ismail R, Ovesen PL, Schmidt V, Madsen LS, Thyrsted J, Gierl S, Breum M, Larsen A, Andersen MN, Romero-Ramos M, Holm CK, Andersen GR, Zhao H, Schuck P, Nygaard JV, Sutherland DS, Eskildsen SF, Willnow TE, Brooks DJ, Vorup-Jensen Tet al., 2024, Amyloid-β aggregates activate peripheral monocytes in mild cognitive impairment., Nat Commun, Vol: 15

The peripheral immune system is important in neurodegenerative diseases, both in protecting and inflaming the brain, but the underlying mechanisms remain elusive. Alzheimer's Disease is commonly preceded by a prodromal period. Here, we report the presence of large Aβ aggregates in plasma from patients with mild cognitive impairment (n = 38). The aggregates are associated with low level Alzheimer's Disease-like brain pathology as observed by 11C-PiB PET and 18F-FTP PET and lowered CD18-rich monocytes. We characterize complement receptor 4 as a strong binder of amyloids and show Aβ aggregates are preferentially phagocytosed and stimulate lysosomal activity through this receptor in stem cell-derived microglia. KIM127 integrin activation in monocytes promotes size selective phagocytosis of Aβ. Hydrodynamic calculations suggest Aβ aggregates associate with vessel walls of the cortical capillaries. In turn, we hypothesize aggregates may provide an adhesion substrate for recruiting CD18-rich monocytes into the cortex. Our results support a role for complement receptor 4 in regulating amyloid homeostasis.

Journal article

Guo WJ, Zou H, Fawcett VA, Canning R, Juneau S, Davis TM, Alexander DM, Jiang L, Aguilar JN, Ahlen S, Brooks D, Claybaugh T, de la Macorra A, Doel P, Fanning K, Forero-Romero JE, Gontcho A Gontcho S, Honscheid K, Kisner T, Kremin A, Landriau M, Meisner A, Miquel R, Moustakas J, Nie J, Pan Z, Poppett C, Prada F, Rezaie M, Rossi G, Siudek M, Sanchez E, Schubnell M, Seo HJ, Sui J, Tarlé G, Zhou Zet al., 2024, Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. I. Sample from the Early Data, Astrophysical Journal, Supplement Series, Vol: 270, ISSN: 0067-0049

Changing-look active galactic nuclei (CL AGNs) can be generally confirmed by the emergence (turn-on) or disappearance (turn-off) of broad emission lines (BELs), associated with a transient timescale (about 100 ∼ 5000 days) that is much shorter than predicted by traditional accretion disk models. We carry out a systematic CL AGN search by crossmatching the spectra coming from the Dark Energy Spectroscopic Instrument and the Sloan Digital Sky Survey. Following previous studies, we identify CL AGNs based on Hα, Hβ, and Mg ii at z ≤ 0.75 and Mg ii, C iii], and C iv at z > 0.75. We present 56 CL AGNs based on visual inspection and three selection criteria, including 2 Hα, 34 Hβ, 9 Mg ii, 18 C iii], and 1 C iv CL AGN. Eight cases show simultaneous appearances/disappearances of two BELs. We also present 44 CL AGN candidates with significant flux variation of BELs, but remaining strong broad components. In the confirmed CL AGNs, 10 cases show additional CL candidate features for different lines. In this paper, we find: (1) a 24:32 ratio of turn-on to turn-off CL AGNs; (2) an upper-limit transition timescale ranging from 330 to 5762 days in the rest frame; and (3) the majority of CL AGNs follow the bluer-when-brighter trend. Our results greatly increase the current CL census (∼30%) and would be conducive to exploring the underlying physical mechanism.

Journal article

Zou S, Jiang L, Cai Z, Moustakas J, Sun Z, Pan Z, Ding J, Forero-Romero JE, Zou H, Ting YS, Pieri M, Ahlen S, Alexander D, Brooks D, Dey A, Font-Ribera A, Gontcho A Gontcho S, Honscheid K, Landriau M, de la Macorra A, Vargas Magana M, Meisner A, Miquel R, Schubnell M, Tarlé G, Zhou Zet al., 2024, DESI Survey Validation Data in the COSMOS/Hyper Suprime-Cam Field: Cool Gas Trace Main-sequence Star-forming Galaxies at the Cosmic Noon, Astrophysical Journal, Vol: 960, ISSN: 0004-637X

We present the first result in exploring the gaseous halo and galaxy correlation using the Dark Energy Spectroscopic Instrument survey validation data in the Cosmic Evolution Survey (COSMOS) and Hyper Suprime-Cam field. We obtain multiphase gaseous halo properties in the circumgalactic medium by using 115 quasar spectra (signal-to-noise ratio > 3). We detect Mg ii absorption at redshift 0.6 < z < 2.5, C iv absorption at 1.6 < z < 3.6, and H i absorption associated with the Mg ii and C iv. By crossmatching the COSMOS2020 catalog, we identify the Mg ii and C iv host galaxies in 10 quasar fields at 0.9< z < 3.1. We find that within the impact parameter of 250 kpc, a tight correlation is seen between the strong Mg ii equivalent width and the host galaxy star formation rate. The covering fraction f c of the strong Mg ii selected galaxies, which is the ratio of the absorbing galaxy in a certain galaxy population, shows significant evolution in the main-sequence galaxies and marginal evolution in all the galaxy populations within 250 kpc at 0.9 < z < 2.2. The f c increase in the main-sequence galaxies likely suggests the coevolution of strong Mg ii absorbing gas and the main-sequence galaxies at the cosmic noon. Furthermore, Mg ii and C iv absorbing gas is detected out of the galaxy virial radius, tentatively indicating the feedback produced by the star formation and/or the environmental effects.

Journal article

Carruba V, Camargo JIB, Aljbaae S, Ferreira FS, Lin E, Figueiredo-Peixoto V, Banda-Huarca MV, Pieres A, Boufleur RC, Da Costa LN, Abbott TMC, Aguena M, Allam SS, Alves O, Bernardinelli PH, Bertin E, Brooks D, Carnero Rosell A, Carretero J, Pereira MES, Davis TM, De Vicente J, Desai S, Doel P, Ferrero I, Friedel D, Frieman J, García-Bellido J, Gatti M, Giannini G, Gruen D, Gruendl RA, Herner K, Hinton SR, Hollowood DL, James DJ, Kent S, Kuehn K, Lahav O, Marshall JL, Mena-Fernández J, Miquel R, Palmese A, Plazas Malagón AA, Rodríguez-Monroy M, Sanchez E, Santiago B, Schubnell M, Smith M, Suchyta E, Swanson MEC, Tarle G, Walker AR, Weaverdyck N, Wiseman Pet al., 2024, Main belt asteroids taxonomical information from dark energy survey data, Monthly Notices of the Royal Astronomical Society, Vol: 527, Pages: 6495-6505, ISSN: 0035-8711

While proper orbital elements are currently available for more than 1 million asteroids, taxonomical information is still lagging behind. Surveys like SDSS-MOC4 provided preliminary information for more than 100 000 objects, but many asteroids still lack even a basic taxonomy. In this study, we use Dark Energy Survey (DES) data to provide new information on asteroid physical properties. By cross-correlating the new DES data base with other data bases, we investigate how asteroid taxonomy is reflected in DES data. While the resolution of DES data is not sufficient to distinguish between different asteroid taxonomies within the complexes, except for V-type objects, it can provide information on whether an asteroid belongs to the C- or S-complex. Here, machine learning methods optimized through the use of genetic algorithms were used to predict the labels of more than 68 000 asteroids with no prior taxonomic information. Using a high-quality, limited set of asteroids with data on gri slopes and i - z colours, we detected 409 new possible V-type asteroids. Their orbital distribution is highly consistent with that of other known V-type objects.

Journal article

Gao H, Jing YP, Xu K, Zhao D, Gui S, Zheng Y, Luo X, Aguilar JN, Ahlen S, Brooks D, Claybaugh T, Cole S, de la Macorra A, Forero-Romero JE, A Gontcho SG, Ishak M, Lambert A, Landriau M, Manera M, Meisner A, Miquel R, Nie J, Rezaie M, Rossi G, Sanchez E, Schubnell M, Seo HJ, Tarlé G, Weaver BA, Zhou Zet al., 2024, The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies, Astrophysical Journal, Vol: 961, ISSN: 0004-637X

Galactic conformity is the phenomenon whereby a galaxy of a certain physical property is correlated with its neighbors of the same property, implying a possible causal relationship. The observed auto correlations of emission-line galaxies (ELGs) from the highly complete DESI One-Percent Survey exhibit a strong clustering signal on small scales, providing clear evidence for the conformity effect of ELGs. Building upon the original subhalo abundance-matching (SHAM) method developed by Gao et al., we propose a concise conformity model to improve the ELG-halo connection. In this model, the number of satellite ELGs is boosted by a factor of ∼5 in the halos whose central galaxies are ELGs. We show that the mean ELG satellite number in such central halos is still smaller than 1 and that the model does not significantly increase the overall satellite fraction. With this model, we can well recover the ELG auto correlations to the smallest scales explored with the current data (i.e., r p > 0.03 Mpc h −1 in real space and at s > 0.3 Mpc h −1 in redshift space), while the cross correlations between luminous red galaxies and ELGs are nearly unchanged. Although our SHAM model has only eight parameters, we further verify that it can accurately describe the ELG clustering in the entire redshift range from z = 0.8 to 1.6. We therefore expect that this method can be used to generate high-quality ELG lightcone mocks for DESI.

Journal article

McNanna M, Bechtol K, Mau S, Nadler EO, Medoff J, Drlica-Wagner A, Cerny W, Crnojević D, Mutlu-Pakdıl B, Vivas AK, Pace AB, Carlin JL, Collins MLM, Ferguson PS, Martínez-Delgado D, Martínez-Vázquez CE, Noel NED, Riley AH, Sand DJ, Smercina A, Tollerud E, Wechsler RH, Abbott TMC, Aguena M, Alves O, Bacon D, Bom CR, Brooks D, Burke DL, Carballo-Bello JA, Carnero Rosell A, Carretero J, da Costa LN, Davis TM, De Vicente J, Diehl HT, Doel P, Ferrero I, Frieman J, Giannini G, Gruen D, Gutierrez G, Gruendl RA, Hinton SR, Hollowood DL, Honscheid K, James DJ, Kuehn K, Marshall JL, Mena-Fernández J, Miquel R, Pereira MES, Pieres A, Malagón AAP, Sakowska JD, Sanchez E, Sanchez Cid D, Santiago B, Sevilla-Noarbe I, Smith M, Stringfellow GS, Suchyta E, Swanson MEC, Tarle G, Weaverdyck N, Wiseman Pet al., 2024, A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55, Astrophysical Journal, Vol: 961, ISSN: 0004-637X

We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 − 0.12 + 0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0 − 0.3 + 0.5 mag and an azimuthally averaged physical half-light radius of 2.2 − 0.4 + 0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.

Journal article

Bom CR, Annis J, Garcia A, Palmese A, Sherman N, Soares-Santos M, Santana-Silva L, Morgan R, Bechtol K, Davis T, Diehl HT, Allam SS, Bachmann TG, Fraga BMO, García-Bellido J, Gill MSS, Herner K, Kilpatrick CD, Makler M, Olivares E F, Pereira MES, Pineda J, Santos A, Tucker DL, Wiesner MP, Aguena M, Alves O, Bacon D, Bernardinelli PH, Bertin E, Bocquet S, Brooks D, Carrasco Kind M, Carretero J, Conselice C, Costanzi M, da Costa LN, De Vicente J, Desai S, Doel P, Everett S, Ferrero I, Frieman J, Gatti M, Gerdes DW, Gruen D, Gruendl RA, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, James DJ, Kuehn K, Kuropatkin N, Melchior P, Mena-Fernández J, Menanteau F, Pieres A, Plazas Malagón AA, Raveri M, Rodriguez-Monroy M, Sanchez E, Santiago B, Sevilla-Noarbe I, Smith M, Suchyta E, Swanson MEC, Tarle G, To C, Weaverdyck Net al., 2024, Designing an Optimal Kilonova Search Using DECam for Gravitational-wave Events, Astrophysical Journal, Vol: 960, ISSN: 0004-637X

We address the problem of optimally identifying all kilonovae detected via gravitational-wave emission in the upcoming LIGO/Virgo/KAGRA observing run, O4, which is expected to be sensitive to a factor of ∼7 more binary neutron star (BNS) alerts than previously. Electromagnetic follow-up of all but the brightest of these new events will require >1 m telescopes, for which limited time is available. We present an optimized observing strategy for the DECam during O4. We base our study on simulations of gravitational-wave events expected for O4 and wide-prior kilonova simulations. We derive the detectabilities of events for realistic observing conditions. We optimize our strategy for confirming a kilonova while minimizing telescope time. For a wide range of kilonova parameters, corresponding to a fainter kilonova compared to GW170817/AT 2017gfo, we find that, with this optimal strategy, the discovery probability for electromagnetic counterparts with the DECam is ∼80% at the nominal BNS gravitational-wave detection limit for O4 (190 Mpc), which corresponds to an ∼30% improvement compared to the strategy adopted during the previous observing run. For more distant events (∼330 Mpc), we reach an ∼60% probability of detection, a factor of ∼2 increase. For a brighter kilonova model dominated by the blue component that reproduces the observations of GW170817/AT 2017gfo, we find that we can reach ∼90% probability of detection out to 330 Mpc, representing an increase of ∼20%, while also reducing the total telescope time required to follow up events by ∼20%.

Journal article

Staer K, Iranzo A, Terkelsen MH, Stokholm MG, Danielsen EH, Østergaard K, Serradell M, Otto M, Svendsen KB, Garrido A, Vilas D, Santamaria J, Møller A, Gaig C, Brooks DJ, Borghammer P, Tolosa E, Pavese Net al., 2024, Progression of brain cholinergic dysfunction in patients with isolated rapid eye movement sleep behavior disorder., Eur J Neurol, Vol: 31

BACKGROUND: Reduced cortical acetylcholinesterase activity, as measured by 11 C-donepezil positron emission tomography (PET), has been reported in patients with isolated rapid eye movement (REM) sleep behavior disorder (iRBD). However, its progression and clinical implications have not been fully investigated. Here, we explored the relationship between longitudinal changes in brain acetylcholinesterase activity and cognitive function in iRBD. METHODS: Twelve iRBD patients underwent 11 C-donepezil PET at baseline and after 3 years. PET images were interrogated with statistical parametric mapping (SPM) and a regions of interest (ROI) approach. Clinical progression was assessed with the Movement Disorder Society-Unified Parkinson's Disease Rating Scale-Part III (MDS-UPDRS-III). Cognitive function was rated using the Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA). RESULTS: From baseline to follow-up, the mean 11 C-donepezil distribution volume ratio (DVR) decreased in the cortex (p = 0.006), thalamus (p = 0.013), and caudate (p = 0.013) ROI. Despite no significant changes in the group mean MMSE or MoCA scores being observed, individually, seven patients showed a decline in their scores on these cognitive tests. Subgroup analysis showed that only the subgroup of patients with a decline in cognitive scores had a significant reduction in mean cortical 11 C-donepezil DVR. CONCLUSIONS: Our results show that severity of brain cholinergic dysfunction in iRBD patients increases significantly over 3 years, and those changes are more severe in those with a decline in cognitive test scores.

Journal article

Webber KB, Hansen TT, Marshall JL, Simon JD, Pace AB, Mutlu-Pakdil B, Drlica-Wagner A, Martínez-Vázquez CE, Aguena M, Allam SS, Alves O, Bertin E, Brooks D, Carnero Rosell A, Carretero J, da Costa LN, De Vicente J, Doel P, Ferrero I, Friedel D, Frieman J, García-Bellido J, Giannini G, Gruen D, Gruendl RA, Hinton SR, Hollowood DL, Honscheid K, Kuehn K, Mena-Fernández J, Menanteau F, Miquel R, Ogando RLC, Pereira MES, Pieres A, Plazas Malagón AA, Sanchez E, Santiago B, Smith JA, Smith M, Suchyta E, Tarle G, To C, Weaverdyck N, Yanny Bet al., 2023, Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate, Astrophysical Journal, Vol: 959, ISSN: 0004-637X

We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M ⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

Journal article

Bernardinelli PH, Bernstein GM, Jindal N, Abbott TMC, Aguena M, Alves O, Andrade-Oliveira F, Annis J, Bacon D, Bertin E, Brooks D, Burke DL, Carnero Rosell A, Carrasco Kind M, Carretero J, da Costa LN, Pereira MES, Davis TM, Desai S, Diehl HT, Doel P, Everett S, Ferrero I, Friedel D, Frieman J, García-Bellido J, Giannini G, Gruen D, Herner K, Hinton SR, Hollowood DL, Honscheid K, James DJ, Kuehn K, Marshall JL, Mena-Fernández J, Menanteau F, Miquel R, Ogando RLC, Palmese A, Pieres A, Plazas Malagón AA, Raveri M, Sanchez E, Sevilla-Noarbe I, Smith M, Suchyta E, Swanson MEC, Tarle G, To C, Walker AR, Wiseman P, Zhang Yet al., 2023, Photometry of Outer Solar System Objects from the Dark Energy Survey. I. Photometric Methods, Light-curve Distributions, and Trans-Neptunian Binaries, Astrophysical Journal, Supplement Series, Vol: 269, ISSN: 0067-0049

We report the methods of and initial scientific inferences from the extraction of precision photometric information for the >800 trans-Neptunian objects (TNOs) discovered in the images of the Dark Energy Survey (DES). Scene-modeling photometry is used to obtain shot-noise-limited flux measures for each exposure of each TNO, with background sources subtracted. Comparison of double-source fits to the pixel data with single-source fits are used to identify and characterize two binary TNO systems. A Markov Chain Monte Carlo method samples the joint likelihood of the intrinsic colors of each source as well as the amplitude of its flux variation, given the time series of multiband flux measurements and their uncertainties. A catalog of these colors and light-curve amplitudes A is included with this publication. We show how to assign a likelihood to the distribution q(A) of light-curve amplitudes in any subpopulation. Using this method, we find decisive evidence (i.e., evidence ratio <0.01) that cold classical (CC) TNOs with absolute magnitude 6 < H r < 8.2 are more variable than the hot classical (HC) population of the same H r , reinforcing theories that the former form in situ and the latter arise from a different physical population. Resonant and scattering TNOs in this H r range have variability consistent with either the HCs or CCs. DES TNOs with H r < 6 are seen to be decisively less variable than higher-H r members of any dynamical group, as expected. More surprising is that detached TNOs are decisively less variable than scattering TNOs, which requires them to have distinct source regions or some subsequent differential processing.

Journal article

Kent S, Neilsen E, Honscheid K, Rabinowitz D, Schlafly EF, Guy J, Schlegel D, García-Bellido J, Li TS, Sanchez E, Silber J, Aguilar J, Ahlen S, Brooks D, Claybaugh T, de la Macorra A, Doel P, Eisenstein DJ, Fanning K, Font-Ribera A, Forero-Romero JE, Gontcho SAG, Jimenez J, Kirkby D, Kisner T, Kremin A, Landriau M, Le Guillou L, Levi ME, Magneville C, Manera M, Martini P, Meisner A, Miquel R, Moustakas J, Nie J, Palanque-Delabrouille N, Percival WJ, Poppett C, Rezaie M, Ross AJ, Rossi G, Schubnell M, Seo H, Tarlé G, Weaver BA, Zhou R, Zhou Z, Zou Het al., 2023, Astrometric Calibration and Performance of the Dark Energy Spectroscopic Instrument Focal Plane, Astronomical Journal, Vol: 166, ISSN: 0004-6256

The Dark Energy Spectroscopic Instrument, consisting of 5020 robotic fiber positioners and associated systems on the Mayall telescope at Kitt Peak, Arizona, is carrying out a survey to measure the spectra of 40 million galaxies and quasars and produce the largest 3D map of the universe to date. The primary science goal is to use baryon acoustic oscillations to measure the expansion history of the universe and the time evolution of dark energy. A key function of the online control system is to position each fiber on a particular target in the focal plane with an accuracy of 11 μm rms 2D. This paper describes the set of software programs used to perform this function along with the methods used to validate their performance.

Journal article

Madsen LS, Kjeldsen PL, Ismail R, Parbo P, Ostergaard L, Brooks DJ, Eskildsen SFet al., 2023, Capillary dysfunction in healthy elderly <i>APOE</i> ε4 carriers with raised brain Aβ deposition, ALZHEIMERS & DEMENTIA, ISSN: 1552-5260

Journal article

Napolitano L, Pandey A, Myers AD, Lan TW, Anand A, Aguilar J, Ahlen S, Alexander DM, Brooks D, Canning R, Circosta C, De La Macorra A, Doel P, Eftekharzadeh S, Fawcett VA, Font-Ribera A, Garcia-Bellido J, Gontcho A Gontcho S, Le Guillou L, Guy J, Honscheid K, Juneau S, Kisner T, Landriau M, Meisner AM, Miquel R, Moustakas J, Percival WJ, Prochaska JX, Schubnell M, Tarlé G, Weaver BA, Weiner B, Zhou Z, Zou H, Zou Set al., 2023, Detecting and Characterizing Mg ii Absorption in DESI Survey Validation Quasar Spectra, Astronomical Journal, Vol: 166, ISSN: 0004-6256

We present findings of the detection of Magnesium II (Mg ii, λ = 2796, 2803 Å) absorbers from the early data release of the Dark Energy Spectroscopic Instrument (DESI). DESI is projected to obtain spectroscopy of approximately 3 million quasars (QSOs), of which over 99% are anticipated to be at redshifts greater than z > 0.3, such that DESI would be able to observe an associated or intervening Mg ii absorber illuminated by the background QSO. We have developed an autonomous supplementary spectral pipeline that detects these systems through an initial line-fitting process and then confirms the line properties using a Markov Chain Monte Carlo sampler. Based upon a visual inspection of the resulting systems, we estimate that this sample has a purity greater than 99%. We have also investigated the completeness of our sample in regard to both the signal-to-noise properties of the input spectra and the rest-frame equivalent width (W 0) of the absorber systems. From a parent catalog containing 83,207 quasars, we detect a total of 23,921 Mg ii absorption systems following a series of quality cuts. Extrapolating from this occurrence rate of 28.8% implies a catalog at the completion of the five-year DESI survey that will contain over eight hundred thousand Mg ii absorbers. The cataloging of these systems will enable significant further research because they carry information regarding circumgalactic medium environments, the distribution of intervening galaxies, and the growth of metallicity across the redshift range 0.3 ≤ z < 2.5.

Journal article

Binda KH, Landau AM, Chacur M, Brooks DJ, Real CCet al., 2023, Treadmill exercise modulates nigral and hippocampal cannabinoid receptor type 1 in the 6-OHDA model of Parkinson's disease, BRAIN RESEARCH, Vol: 1814, ISSN: 0006-8993

Journal article

Zaborowski EA, Drlica-Wagner A, Ashmead F, Wu JF, Morgan R, Bom CR, Shajib AJ, Birrer S, Cerny W, Buckley-Geer EJ, Mutlu-Pakdil B, Ferguson PS, Glazebrook K, Lozano SJG, Gordon Y, Martinez M, Manwadkar V, O'Donnell J, Poh J, Riley A, Sakowska JD, Santana-Silva L, Santiago BX, Sluse D, Tan CY, Tollerud EJ, Verma A, Carballo-Bello JA, Choi Y, James DJ, Kuropatkin N, Martinez-Vazquez CE, Nidever DL, Castellon JLN, Noël NED, Olsen KAG, Pace AB, Mau S, Yanny B, Zenteno A, Abbott TMC, Aguena M, Alves O, Andrade-Oliveira F, Bocquet S, Brooks D, Burke DL, Carnero Rosell A, Carrasco Kind M, Carretero J, Castander FJ, Conselice CJ, Costanzi M, Pereira MES, De Vicente J, Desai S, Dietrich JP, Doel P, Everett S, Ferrero I, Flaugher B, Friedel D, Frieman J, Garcia-Bellido J, Gruen D, Gruendl RA, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, Kuehn K, Lin H, Marshall JL, Melchior P, Mena-Fernandez J, Menanteau F, Miquel R, Palmese A, Paz-Chinchon F, Pieres A, Malagon AAP, Prat J, Rodriguez-Monroy M, Romer AK, Sanchez E, Scarpine V, Sevilla-Noarbe I, Smith M, Suchyta E, To C, Weaverdyck Net al., 2023, Identification of Galaxy-Galaxy Strong Lens Candidates in the DECam Local Volume Exploration Survey Using Machine Learning, Astrophysical Journal, Vol: 954, ISSN: 0004-637X

We perform a search for galaxy-galaxy strong lens systems using a convolutional neural network (CNN) applied to imaging data from the first public data release of the DECam Local Volume Exploration Survey, which contains 1/4520 million astronomical sources covering 1/44000 deg2 of the southern sky to a 5σ point-source depth of g = 24.3, r = 23.9, i = 23.3, and z = 22.8 mag. Following the methodology of similar searches using Dark Energy Camera data, we apply color and magnitude cuts to select a catalog of 1/411 million extended astronomical sources. After scoring with our CNN, the highest-scoring 50,000 images were visually inspected and assigned a score on a scale from 0 (not a lens) to 3 (very probable lens). We present a list of 581 strong lens candidates, 562 of which are previously unreported. We categorize our candidates using their human-assigned scores, resulting in 55 Grade A candidates, 149 Grade B candidates, and 377 Grade C candidates. We additionally highlight eight potential quadruply lensed quasars from this sample. Due to the location of our search footprint in the northern Galactic cap (b > 10 deg) and southern celestial hemisphere (decl. < 0 deg), our candidate list has little overlap with other existing ground-based searches. Where our search footprint does overlap with other searches, we find a significant number of high-quality candidates that were previously unidentified, indicating a degree of orthogonality in our methodology. We report properties of our candidates including apparent magnitude and Einstein radius estimated from the image separation.

Journal article

Gao H, Jing YP, Gui S, Xu K, Zheng Y, Zhao D, Aguilar JN, Ahlen S, Brooks D, Claybaugh T, Dawson K, xde la Macorra A, Doel P, Fanning K, Forero-Romero JE, A Gontcho SG, Guy J, Honscheid K, Kehoe R, Landriau M, Manera M, Meisner A, Miquel R, Moustakas J, Newman JA, Nie J, Percival W, Rossi G, Schubnell M, Seo HJ, Tarlé G, Weaver BA, Yu J, Zhou Zet al., 2023, The DESI One-Percent Survey: Constructing Galaxy-Halo Connections for ELGs and LRGs Using Auto and Cross Correlations, Astrophysical Journal, Vol: 954, ISSN: 0004-637X

In the current Dark Energy Spectroscopic Instrument (DESI) survey, emission line galaxies (ELGs) and luminous red galaxies (LRGs) are essential for mapping the dark matter distribution at N M . We measure the auto and cross correlation functions of ELGs and LRGs at 108.0 M ⊙ from the DESI One-Percent survey. Following Gao et al., we construct the galaxy-halo connections for ELGs and LRGs simultaneously. With the stellar-halo mass relation for the whole galaxy population (i.e., normal galaxies), LRGs can be selected directly by stellar mass, while ELGs can also be selected randomly based on the observed number density of each stellar mass, once the probability z ∼ 0.2 of a satellite galaxy becoming an ELG is determined. We demonstrate that the observed small scale clustering prefers a halo mass-dependent z ∼ 0.2 model rather than a constant. With this model, we can well reproduce the auto correlations of LRGs and the cross correlations between LRGs and ELGs at z ∼ 0.7 z ∼ 1. We can also reproduce the auto correlations of ELGs at deg2 z ∼ 1 (0.6 < z < 1.6 z ∼ 1) in real (redshift) space. Although our model has only seven parameters, we show that it can be extended to higher redshifts and reproduces the observed auto correlations of ELGs in the whole range of ∼1012 M ⊙, which enables us to generate a lightcone ELG mock for DESI. With the above model, we further derive halo occupation distributions for ELGs, which can be used to produce ELG mocks in coarse simulations without resolving subhalos.

Journal article

Darragh-Ford E, Wu JF, Mao YY, Wechsler RH, Geha M, Forero-Romero JE, Hahn CH, Kallivayalil N, Moustakas J, Nadler EO, Nowotka M, Peek JEG, Tollerud EJ, Weiner B, Aguilar J, Ahlen S, Brooks D, Cooper AP, de la Macorra A, Dey A, Fanning K, Font-Ribera A, Gontcho A Gontcho S, Honscheid K, Kisner T, Kremin A, Landriau M, Levi ME, Martini P, Meisner AM, Miquel R, Myers AD, Nie J, Palanque-Delabrouille N, Percival WJ, Prada F, Schlegel D, Schubnell M, Tarlé G, Vargas-Magaña M, Zhou Z, Zou Het al., 2023, Target Selection and Sample Characterization for the DESI LOW-Z Secondary Target Program, Astrophysical Journal, Vol: 954, ISSN: 0004-637X

We introduce the DESI LOW-Z Secondary Target Survey, which combines the wide-area capabilities of the Dark Energy Spectroscopic Instrument (DESI) with an efficient, low-redshift target selection method. Our selection consists of a set of color and surface brightness cuts, combined with modern machine-learning methods, to target low-redshift dwarf galaxies (z < 0.03) between 19 < r < 21 with high completeness. We employ a convolutional neural network (CNN) to select high-priority targets. The LOW-Z survey has already obtained over 22,000 redshifts of dwarf galaxies (M * < 109 M ⊙), comparable to the number of dwarf galaxies discovered in the Sloan Digital Sky Survey DR8 and GAMA. As a spare fiber survey, LOW-Z currently receives fiber allocation for just ∼50% of its targets. However, we estimate that our selection is highly complete: for galaxies at z < 0.03 within our magnitude limits, we achieve better than 95% completeness with ∼1% efficiency using catalog-level photometric cuts. We also demonstrate that our CNN selections z < 0.03 galaxies from the photometric cuts subsample at least 10 times more efficiently while maintaining high completeness. The full 5 yr DESI program will expand the LOW-Z sample, densely mapping the low-redshift Universe, providing an unprecedented sample of dwarf galaxies, and providing critical information about how to pursue effective and efficient low-redshift surveys.

Journal article

Brodzeller A, Dawson K, Bailey S, Yu J, Ross AJ, Bault A, Filbert S, Aguilar J, Ahlen S, Alexander DM, Armengaud E, Berti A, Brooks D, Chaussidon E, de la Macorra A, Doel P, Fanning K, Fawcett VA, Font-Ribera A, A Gontcho SG, Guy J, Honscheid K, Juneau S, Kehoe R, Kisner T, Kremin A, Lan TW, Landriau M, Levi ME, Magneville C, Martini P, Meisner AM, Miquel R, Moustakas J, Palanque-Delabrouille N, Percival WJ, Prada F, Ravoux C, Rossi G, Saulder C, Siudek M, Tarlé G, Weaver BA, Youles S, Zheng Z, Zhou R, Zhou Zet al., 2023, Performance of the Quasar Spectral Templates for the Dark Energy Spectroscopic Instrument, Astronomical Journal, Vol: 166, ISSN: 0004-6256

Millions of quasar spectra will be collected by the Dark Energy Spectroscopic Instrument (DESI), leading to a fourfold increase in the number of known quasars. High-accuracy quasar classification is essential to tighten constraints on cosmological parameters measured at the highest redshifts DESI observes (z > 2.0). We present spectral templates for identification and redshift estimation of quasars in the DESI Year 1 data release. The quasar templates are comprised of two quasar eigenspectra sets, trained on spectra from the Sloan Digital Sky Survey. The sets are specialized to reconstruct quasar spectral variation observed over separate yet overlapping redshift ranges and, together, are capable of identifying DESI quasars from 0.05 < z < 7.0. The new quasar templates show significant improvement over the previous DESI quasar templates regarding catastrophic failure rates, redshift precision and accuracy, quasar completeness, and the contamination fraction in the final quasar sample.

Journal article

Kjeldsen PL, Damholdt MF, Madsen LS, Nissen PH, Aanerud JFA, Parbo P, Ismail R, Kaasing M, Eskildsen SF, Ostergaard L, Brooks DJet al., 2023, Performance on complex memory tests is associated with ß-amyloid in individuals at risk of developing Alzheimer's disease, JOURNAL OF NEUROPSYCHOLOGY, ISSN: 1748-6645

Journal article

Elvin-Poole J, MacCrann N, Everett S, Prat J, Rykoff ES, DeVicente J, Yanny B, Herner K, Ferte A, DiValentino E, Choi A, Burke DL, Sevilla-Noarbe I, Alarcon A, Alves O, Amon A, Andrade-Oliveira F, Baxter E, Bechtol K, Becker MR, Bernstein GM, Blazek J, Camacho H, Campos A, Rosell AC, Kind MC, Cawthon R, Chang C, Chen R, Cordero J, Crocce M, Davis C, DeRose J, Diehl HT, Dodelson S, Doux C, Drlica-Wagner A, Eckert K, Eifler TF, Elsner F, Fang X, Fosalba P, Friedrich O, Gatti M, Giannini G, Gruen D, Gruendl RA, Harrison I, Hartley WG, Huang H, Huff EM, Huterer D, Krause E, Kuropatkin N, Leget P-F, Lemos P, Liddle AR, McCullough J, Muir J, Myles J, Navarro-Alsina A, Pandey S, Park Y, Porredon A, Raveri M, Rodriguez-Monroy M, Rollins RP, Roodman A, Rosenfeld R, Ross AJ, Sanchez C, Sanchez J, Secco LF, Sheldon E, Shin T, Troxel MA, Tutusaus I, Varga TN, Weaverdyck N, Wechsler RH, Yin B, Zhang Y, Zuntz J, Aguena M, Avila S, Bacon D, Bertin E, Bocquet S, Brooks D, Garcia-Bellido J, Honscheid K, Jarvis M, Li TS, Mena-Fernandez J, To C, Wilkinson RDet al., 2023, Dark Energy Survey Year 3 results: magnification modelling and impact on cosmological constraints from galaxy clustering and galaxy-galaxy lensing, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 523, Pages: 3649-3670, ISSN: 0035-8711

Journal article

Hahn CH, Wilson MJ, Ruiz-Macias O, Cole S, Weinberg DH, Moustakas J, Kremin A, Tinker JL, Smith A, Wechsler RH, Ahlen S, Alam S, Bailey S, Brooks D, Cooper AP, Davis TM, Dawson K, Dey A, Dey B, Eftekharzadeh S, Eisenstein DJ, Fanning K, Forero-Romero JE, Frenk CS, Gaztañaga E, Gontcho SGA, Guy J, Honscheid K, Ishak M, Juneau S, Kehoe R, Kisner T, Lan TW, Landriau M, Le Guillou L, Levi ME, Magneville C, Martini P, Meisner A, Myers AD, Nie J, Norberg P, Palanque-Delabrouille N, Percival WJ, Poppett C, Prada F, Raichoor A, Ross AJ, Safonova S, Saulder C, Schlafly E, Schlegel D, Sierra-Porta D, Tarle G, Weaver BA, Yèche C, Zarrouk P, Zhou R, Zhou Z, Zou Het al., 2023, The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation, Astronomical Journal, Vol: 165, ISSN: 0004-6256

Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI Bright Galaxy Survey (BGS) will produce the most detailed map of the universe during the dark-energy-dominated epoch with redshifts of >10 million galaxies spanning 14,000 deg2. In this work, we present and validate the final BGS target selection and survey design. From the Legacy Surveys, BGS will target an r < 19.5 mag limited sample (BGS Bright), a fainter 19.5 < r < 20.175 color-selected sample (BGS Faint), and a smaller low-z quasar sample. BGS will observe these targets using exposure times scaled to achieve homogeneous completeness and cover the footprint three times. We use observations from the Survey Validation programs conducted prior to the main survey along with simulations to show that BGS can complete its strategy and make optimal use of “bright” time. BGS targets have stellar contamination <1%, and their densities do not depend strongly on imaging properties. BGS Bright will achieve >80% fiber assignment efficiency. Finally, BGS Bright and BGS Faint will achieve >95% redshift success over any observing condition. BGS meets the requirements for an extensive range of scientific applications. BGS will yield the most precise baryon acoustic oscillation and redshift-space distortion measurements at z < 0.4. It presents opportunities for new methods that require highly complete and dense samples (e.g., N-point statistics, multitracers). BGS further provides a powerful tool to study galaxy populations and the relations between galaxies and dark matter.

Journal article

Lee J, Acevedo M, Sako M, Vincenzi M, Brout D, Sanchez B, Chen R, Davis TM, Jarvis M, Scolnic D, Qu H, Galbany L, Kessler R, Lasker J, Sullivan M, Wiseman P, Aguena M, Allam S, Alves O, Andrade-Oliveira F, Bertin E, Bocquet S, Brooks D, Burke DL, Rosell AC, Kind MC, Carretero J, Costanzi M, da Costa LN, Pereira MES, De Vicente J, Desai S, Diehl HT, Doel P, Everett S, Ferrero I, Friedel D, Frieman J, Garcia-Bellido J, Gerdes DW, Gruen D, Gruendl RA, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, James DJ, Kent S, Kuehn K, Kuropatkin N, Mena-Fernandez J, Miquel R, Ogando RLC, Palmese A, Pieres A, Malagon AAP, Raveri M, Reil K, Rodriguez-Monroy M, Sanchez E, Scarpine V, Sevilla-Noarbe I, Smith M, Suchyta E, Tarle G, To C, Weaverdyck Net al., 2023, The Dark Energy Survey Supernova Program: Corrections on Photometry Due to Wavelength-dependent Atmospheric Effects, ASTRONOMICAL JOURNAL, Vol: 165, ISSN: 0004-6256

Journal article

Bernstein GM, Holler BJ, Navarro-Escamilla R, Bernardinelli PH, Abbott TMC, Aguena M, Allam S, Alves O, Andrade-Oliveira F, Annis J, Bacon D, Brooks D, Burke DL, Carnero Rosell A, Carretero J, da Costa LN, Pereira MES, De Vicente J, Desai S, Doel P, Drlica-Wagner A, Everett S, Ferrero I, Frieman J, García-Bellido J, Gerdes DW, Gruen D, Gutierrez G, Herner K, Hinton SR, Hollowood DL, Honscheid K, James DJ, Kuehn K, Kuropatkin N, Marshall JL, Mena-Fernández J, Miquel R, Ogando RLC, Pieres A, Malagón AAP, Raveri M, Reil K, Sanchez E, Sevilla-Noarbe I, Smith M, Soares-Santos M, Suchyta E, Swanson MEC, Wiseman Pet al., 2023, Synchronous Rotation in the (136199) Eris-Dysnomia System, Planetary Science Journal, Vol: 4

We combine photometry of Eris from a 6 month campaign on the Palomar 60 inch telescope in 2015, a 1 month Hubble Space Telescope WFC3 campaign in 2018, and Dark Energy Survey data spanning 2013-2018 to determine a light curve of definitive period 15.771 ± 0.008 days (1σ formal uncertainties), with nearly sinusoidal shape and peak-to-peak flux variation of 3%. This is consistent at part-per-thousand precision with the P = 15.785 90 ± 0.00005 day sidereal period of Dysnomia’s orbit around Eris, strengthening the recent detection of synchronous rotation of Eris by Szakáts et al. with independent data. Photometry from Gaia are consistent with the same light curve. We detect a slope of 0.05 ± 0.01 mag per degree of Eris’s brightness with respect to illumination phase averaged across g, V, and r bands, intermediate between Pluto’s and Charon’s values. Variations of 0.3 mag are detected in Dysnomia’s brightness, plausibly consistent with a double-peaked light curve at the synchronous period. The synchronous rotation of Eris is consistent with simple tidal models initiated with a giant-impact origin of the binary, but is difficult to reconcile with gravitational capture of Dysnomia by Eris. The high albedo contrast between Eris and Dysnomia remains unexplained in the giant-impact scenario.

Journal article

Chaudhuri KR, Leta V, Bannister K, Brooks DJJ, Svenningsson Pet al., 2023, The noradrenergic subtype of Parkinson disease: from animal models to clinical practice, NATURE REVIEWS NEUROLOGY, Vol: 19, Pages: 333-345, ISSN: 1759-4758

Journal article

Andersen KB, Hansen AK, Schacht AC, Horsager J, Gottrup H, Klit H, Danielsen EH, Poston KL, Pavese N, Brooks DJ, Borghammer Pet al., 2023, Synaptic Density and Glucose Consumption in Patients with Lewy Body Diseases: An [<SUP>11</SUP>C]UCB-J and [<SUP>18</SUP>F]FDG PET Study, MOVEMENT DISORDERS, Vol: 38, Pages: 796-805, ISSN: 0885-3185

Journal article

Prat J, Zacharegkas G, Park Y, MacCrann N, Switzer ER, Pandey S, Chang C, Blazek J, Miquel R, Alarcon A, Alves O, Amon A, Andrade-Oliveira F, Bechtol K, Becker MR, Bernstein GM, Chen R, Choi A, Camacho H, Campos A, Rosell AC, Carrasco Kind M, Cawthon R, Cordero J, Crocce M, Davis C, DeRose J, Diehl HT, Dodelson S, Doux C, Drlica-Wagner A, Eckert K, Eifler TF, Elvin-Poole J, Everett S, Fang X, Ferte A, Fosalba P, Friedrich O, Gatti M, Giannini G, Gruen D, Gruendl RA, Harrison I, Hartley WG, Herner K, Huang H, Huff EM, Jarvis M, Krause E, Kuropatkin N, Leget P-F, McCullough J, Myles J, Navarro-Alsina A, Porredon A, Raveri M, Rollins RP, Roodman A, Rosenfeld R, Ross AJ, Rykoff ES, Sanchez C, Sanchez J, Secco LF, Sevilla-Noarbe I, Sheldon E, Shin T, Troxel MA, Tutusaus I, Varga TN, Yanny B, Yin B, Zhang Y, Zuntz J, Aguena M, Allam S, Annis J, Bacon D, Bertin E, Bocquet S, Brooks D, Burke DL, Carretero J, Costanzi M, Pereira MES, De Vicente J, Desai S, Ferrero I, Flaugher B, Gerdes DW, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, James DJ, Lima M, Menanteau F, Mena-Fernandez J, Palmese A, Paterno M, Paz-Chinchon F, Pieres A, Plazas Malagon AA, Rodriguez-Monroy M, Sanchez E, Schubnell M, Smith M, Soares-Santos M, Suchyta E, Swanson MEC, Tarle G, To C, Weaverdyck N, Weller Jet al., 2023, Non-local contribution from small scales in galaxy-galaxy lensing: comparison of mitigation schemes, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 522, Pages: 412-425, ISSN: 0035-8711

Journal article

Abbott TMC, Aguena M, Alarcon A, Alves O, Amon A, Andrade-Oliveira F, Annis J, Avila S, Bacon D, Baxter E, Bechtol K, Becker MR, Bernstein GM, Birrer S, Blazek J, Bocquet S, Brandao-Souza A, Bridle SL, Brooks D, Burke DL, Camacho H, Campos A, Rosell AC, Kind MC, Carretero J, Castander FJ, Cawthon R, Chang C, Chen A, Chen R, Choi A, Conselice C, Cordero J, Costanzi M, Crocce M, da Costa LN, Pereira MES, Davis C, Davis TM, DeRose J, Desai S, Di Valentino E, Diehl HT, Dodelson S, Doel P, Doux C, Drlica-Wagner A, Eckert K, Eifler TF, Elsner F, Elvin-Poole J, Everett S, Fang X, Farahi A, Ferrero I, Ferte A, Flaugher B, Fosalba P, Friedel D, Friedrich O, Frieman J, Garcia-Bellido J, Gatti M, Giani L, Giannantonio T, Giannini G, Gruen D, Gruendl RA, Gschwend J, Gutierrez G, Hamaus N, Harrison I, Hartley WG, Herner K, Hinton SR, Hollowood DL, Honscheid K, Huang H, Huff EM, Huterer D, Jain B, James DJ, Jarvis M, Jeffrey N, Jeltema T, Kovacs A, Krause E, Kuehn K, Kuropatkin N, Lahav O, Lee S, Leget P-F, Lemos P, Leonard CD, Liddle AR, Lima M, Lin H, MacCrann N, Marshall JL, McCullough J, Mena-Fernandez J, Menanteau F, Miquel R, Miranda V, Mohr JJ, Muir J, Myles J, Nadathur S, Navarro-Alsina A, Nichol RC, Ogando RLC, Omori Y, Palmese A, Pandey S, Park Y, Paterno M, Paz-Chinchon F, Percival WJ, Pieres A, Malagon AAP, Porredon A, Prat J, Raveri M, Rodriguez-Monroy M, Rogozenski P, Rollins RP, Romer AK, Roodman A, Rosenfeld R, Ross AJ, Rykoff ES, Samuroff S, Sanchez C, Sanchez E, Sanchez J, Cid DS, Scarpine V, Scolnic D, Secco LF, Sevilla-Noarbe I, Sheldon E, Shin T, Smith M, Soares-Santos M, Suchyta E, Tabbutt M, Tarle G, Thomas D, To C, Troja A, Troxel MA, Tutusaus I, Varga TN, Vincenzi M, Walker AR, Weaverdyck N, Wechsler RH, Weller J, Yanny B, Yin B, Zhang Y, Zuntz Jet al., 2023, Dark Energy Survey Year 3 results: Constraints on extensions to ΛCDM with weak lensing and galaxy clustering, PHYSICAL REVIEW D, Vol: 107, ISSN: 2470-0010

Journal article

Cooper AP, Koposov SE, Allende Prieto C, Manser CJ, Kizhuprakkat N, Myers AD, Dey A, Gansicke BT, Li TS, Rockosi C, Valluri M, Najita J, Deason A, Raichoor A, Wang M-Y, Ting Y-S, Kim B, Carrillo A, Wang W, Beraldo e Silva L, Han JJ, Ding J, Sanchez-Conde M, Aguilar JN, Ahlen S, Bailey S, Belokurov V, Brooks D, Cunha K, Dawson K, de la Macorra A, Doel P, Eisenstein DJ, Fagrelius P, Fanning K, Font-Ribera A, Forero-Romero JE, Gaztanaga E, Gontcho SGA, Guy J, Honscheid K, Kehoe R, Kisner T, Kremin A, Landriau M, Levi ME, Martini P, Meisner AM, Miquel R, Moustakas J, Nie JJD, Palanque-Delabrouille N, Percival WJ, Poppett C, Prada F, Rehemtulla N, Schlafly E, Schlegel D, Schubnell M, Sharples RM, Tarle G, Wechsler RH, Weinberg DH, Zhou Z, Zou Het al., 2023, Overview of the DESI Milky Way Survey, ASTROPHYSICAL JOURNAL, Vol: 947, ISSN: 0004-637X

Journal article

Guy J, Bailey S, Kremin A, Alam S, Alexander DM, Allende Prieto C, BenZvi S, Bolton AS, Brooks D, Chaussidon E, Cooper AP, Dawson K, de la Macorra A, Dey A, Dey B, Dhungana G, Eisenstein DJ, Font-Ribera A, Forero-Romero JE, Gaztanaga E, Gontcho SGA, Green D, Honscheid K, Ishak M, Kehoe R, Kirkby D, Kisner T, Koposov SE, Lan T-W, Landriau M, Le Guillou L, Levi ME, Magneville C, Manser CJ, Martini P, Meisner AM, Miquel R, Moustakas J, Myers AD, Newman JA, Nie J, Palanque-Delabrouille N, Percival WJ, Poppett C, Prada F, Raichoor A, Ravoux C, Ross AJ, Schlafly EF, Schlegel D, Schubnell M, Sharples RM, Tarle G, Weaver BA, Yeche C, Zhou R, Zhou Z, Zou Het al., 2023, The Spectroscopic Data Processing Pipeline for the Dark Energy Spectroscopic Instrument, ASTRONOMICAL JOURNAL, Vol: 165, ISSN: 0004-6256

Journal article

Setton DJ, Dey B, Khullar G, Bezanson R, Newman JA, Aguilar JN, Ahlen S, Andrews BH, Brooks D, De La Macorra A, Dey A, Eftekharzadeh S, Font-Ribera A, A Gontcho SG, Kremin A, Juneau S, Landriau M, Meisner A, Miquel R, Moustakas J, Pearl A, Prada F, Tarlé G, Siudek M, Weaver BA, Zhou Z, Zou Het al., 2023, DESI Survey Validation Spectra Reveal an Increasing Fraction of Recently Quenched Galaxies at z ∼1, Astrophysical Journal Letters, Vol: 947, ISSN: 2041-8205

We utilize 17,000 bright luminous red galaxies (LRGs) from the novel Dark Energy Spectroscopic Instrument Survey Validation spectroscopic sample, leveraging its deep (2.5 hr galaxy-1 exposure time) spectra to characterize the contribution of recently quenched galaxies to the massive galaxy population at 0.4 < z < 1.3. We use Prospector to infer nonparametric star formation histories and identify a significant population of recently quenched galaxies that have joined the quiescent population within the past 1 Gyr. The highest-redshift subset (277 at z > 1) of our sample of recently quenched galaxies represents the largest spectroscopic sample of post-starburst galaxies at that epoch. At 0.4 < z < 0.8, we measure the number density of quiescent LRGs, finding that recently quenched galaxies constitute a growing fraction of the massive galaxy population with increasing look-back time. Finally, we quantify the importance of this population among massive ( log(M⋆/M⊙) > 11.2) LRGs by measuring the fraction of stellar mass each galaxy formed in the gigayear before observation, f 1 Gyr. Although galaxies with f 1 Gyr > 0.1 are rare at z ∼0.4 ( 20.5% of the population), by z ∼0.8, they constitute 3% of massive galaxies. Relaxing this threshold, we find that galaxies with f 1 Gyr > 5% constitute 10% of the massive galaxy population at z ∼0.8. We also identify a small but significant sample of galaxies at z = 1.1-1.3 that formed with f 1 Gyr > 50%, implying that they may be analogs to high-redshift quiescent galaxies that formed on similar timescales. Future analysis of this unprecedented sample promises to illuminate the physical mechanisms that drive the quenching of massive galaxies after cosmic noon.

Journal article

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