Imperial College London

Dr Clements

Faculty of Natural SciencesDepartment of Physics

Reader in Astrophysics
 
 
 
//

Contact

 

+44 (0)20 7594 7693d.clements

 
 
//

Location

 

1011Blackett LaboratorySouth Kensington Campus

//

Summary

 

Publications

Publication Type
Year
to

466 results found

Symeonidis M, Maddox N, Jarvis MJ, Michalowski MJ, Andreani P, Clements DL, De Zotti G, Duivenvoorden S, Gonzalez-Nuevo J, Ibar E, Ivison RJ, Leeuw L, Page MJ, Shirley R, Smith MWL, Vaccari Met al., 2022, The star formation rates of QSOs, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 514, Pages: 4450-4464, ISSN: 0035-8711

Journal article

Shim H, Lee D, Kim Y, Scott D, Serjeant S, Ao Y, Barrufet L, Chapman SC, Clements DL, Conselice CJ, Goto T, Greve TR, Hwang HS, Im M, Jeong W-S, Kim HK, Kim M, Kim SJ, Kong AKH, Koprowski MP, Malkan MA, Michalowski MJ, Pearson C, Seo H, Takagi T, Toba Y, White GJ, Woo J-Het al., 2022, Multiwavelength properties of 850-mu m selected sources from the North Ecliptic Pole SCUBA-2 survey, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 514, Pages: 2915-2935, ISSN: 0035-8711

Journal article

Greaves JS, Rimmer PB, Richards AMS, Petkowski JJ, Bains W, Ranjan S, Seager S, Clements DL, Silva CS, Fraser HJet al., 2022, Low levels of sulphur dioxide contamination of Venusian phosphine spectra, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 514, Pages: 2994-3001, ISSN: 0035-8711

Journal article

Farrah D, Efstathiou A, Afonso J, Bernard-Salas J, Cairns J, Clements DL, Croker K, Hatziminaoglou E, Joyce M, Lacy M, Lebouteiller V, Lieblich A, Lonsdale C, Oliver S, Pearson C, Petty S, Pitchford LK, Rigopoulou D, Rowan-Robinson M, Runburg J, Spoon H, Verma A, Wang Let al., 2022, Stellar and black hole assembly in z < 0.3 infrared-luminous mergers: intermittent starbursts versus super-Eddington accretion, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 513, Pages: 4770-4786, ISSN: 0035-8711

Journal article

Efstathiou A, Farrah D, Afonso J, Clements DL, Gonzalez-Alfonso E, Lacy M, Oliver S, Lesta VP, Pearson C, Rigopoulou D, Rowan-Robinson M, Spoon HWW, Verma A, Wang Let al., 2022, A new look at local ultraluminous infrared galaxies: the atlas and radiative transfer models of their complex physics, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 512, Pages: 5183-5213, ISSN: 0035-8711

Journal article

Runburg J, Farrah D, Sajina A, Lacy M, Lidua J, Hatziminaoglou E, Brandt WN, Chen C-TJ, Nyland K, Shirley R, Clements DL, Pitchford LKet al., 2022, Consistent Analysis of the AGN LF in X-Ray and MIR in the XMM-LSS Field, ASTROPHYSICAL JOURNAL, Vol: 924, ISSN: 0004-637X

Journal article

Manning SM, Casey CM, Zavala JA, Magdis GE, Drew PM, Champagne JB, Aravena M, Bethermin M, Clements DL, Finkelstein SL, Fujimoto S, Hayward CC, Hodge JA, Ilbert O, Kartaltepe JS, Knudsen KK, Koekemoer AM, Man AWS, Sanders DB, Sheth K, Spilker JS, Staguhn J, Talia M, Treister E, Yun MSet al., 2022, Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies, ASTROPHYSICAL JOURNAL, Vol: 925, ISSN: 0004-637X

Journal article

Smith MWL, Eales SA, Williams TG, Lee B, Li Z, Barmby P, Bureau M, Chapman S, Cho BS, Chung A, Chung EJ, Chung H-H, Clark CJR, Clements DL, Davis TA, De Looze I, Eden DJ, Athikkat-Eknath G, Ford GP, Gao Y, Gear W, Gomez HL, de Grijs R, He J, Ho LC, Hughes TM, Jiao S, Li Z, Kemper F, Kirchschlager F, Koch EW, Kong AKH, Lee C-H, Lin E-T, Mairs S, Michalowski MJ, Pattle K, Peng Y, Ragan SE, Rawlings MG, Rigopoulou D, Saintonge A, Schruba A, Tang X, Wang J, Whitworth AP, Wilson CD, Yim K, Zhu Met al., 2021, The HASHTAG Project: The First Submillimeter Images of the Andromeda Galaxy from the Ground, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 257, ISSN: 0067-0049

Journal article

Casey CM, Zavala JA, Manning SM, Aravena M, Bethermin M, Caputi KI, Champagne JB, Clements DL, Drew P, Finkelstein SL, Fujimoto S, Hayward CC, Dekel AM, Kokorev V, del P Lagos C, Long AS, Magdis GE, Man AWS, Mitsuhashi I, Popping G, Spilker J, Staguhn J, Talia M, Toft S, Treister E, Weaver JR, Yun Met al., 2021, Mapping Obscuration to Reionization with ALMA (MORA): 2 mm Efficiently Selects the Highest-redshift Obscured Galaxies, ASTROPHYSICAL JOURNAL, Vol: 923, ISSN: 0004-637X

Journal article

Greaves JS, Richards AMS, Bains W, Rimmer PB, Sagawa H, Clements DL, Seager S, Petkowski JJ, Sousa-Silva C, Ranjan S, Drabek-Maunder E, Fraser HJ, Cartwright A, Mueller-Wodarg I, Zhan Z, Friberg P, Coulson I, Lee E, Hoge Jet al., 2021, Phosphine gas in the cloud deck of Venus (vol 5, pg 655, 2021), Nature Astronomy, Vol: 5, Pages: 726-728, ISSN: 2397-3366

Journal article

Greaves JS, Richards AMS, Bains W, Rimmer PB, Clements DL, Seager S, Petkowski JJ, Sousa-Silva C, Ranjan S, Fraser HJet al., 2021, Reply to: No evidence of phosphine in the atmosphere of Venus from independent analyses, NATURE ASTRONOMY, Vol: 5, Pages: 636-+, ISSN: 2397-3366

Journal article

Zavala JA, Casey CM, Manning SM, Aravena M, Bethermin M, Caputi KI, Clements DL, da Cunha E, Drew P, Finkelstein SL, Fujimoto S, Hayward C, Hodge J, Kartaltepe JS, Knudsen K, Koekemoer AM, Long AS, Magdis GE, Man AWS, Popping G, Sanders D, Scoville N, Sheth K, Staguhn J, Toft S, Treister E, Vieira JD, Yun MSet al., 2021, The Evolution of the IR Luminosity Function and Dust-obscured Star Formation over the Past 13 Billion Years, ASTROPHYSICAL JOURNAL, Vol: 909, ISSN: 0004-637X

Journal article

Lacy M, Surace JA, Farrah D, Nyland K, Afonso J, Brandt WN, Clements DL, Lagos CDP, Maraston C, Pforr J, Sajina A, Sako M, Vaccari M, Wilson G, Ballantyne DR, Barkhouse WA, Brunner R, Cane R, Clarke TE, Cooper M, Cooray A, Covone G, D'Andrea C, Evrard AE, Ferguson HC, Frieman J, Gonzalez-Perez V, Gupta R, Hatziminaoglou E, Huang J, Jagannathan P, Jarvis MJ, Jones KM, Kimball A, Lidman C, Lubin L, Marchetti L, Martini P, McMahon RG, Mei S, Messias H, Murphy EJ, Newman JA, Nichol R, Norris RP, Oliver S, Perez-Fournon I, Peters WM, Pierre M, Polisensky E, Richards GT, Ridgway SE, Rottgering HJA, Seymour N, Shirley R, Somerville R, Strauss MA, Suntzeff N, Thorman PA, van Kampen E, Verma A, Wechsler R, Wood-Vasey WMet al., 2021, A Spitzer survey of Deep Drilling Fields to be targeted by the Vera C. Rubin Observatory Legacy Survey of Space and Time, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 501, Pages: 892-910, ISSN: 0035-8711

Journal article

Riechers DA, Nayyeri H, Burgarella D, Emonts BHC, Clements DL, Cooray A, Ivison RJ, Oliver S, Perez-Fournon I, Rigopoulou D, Scott Det al., 2021, Rise of the titans: gas excitation and feedback in a binary hyper-luminous dusty starburst galaxy at z~6, Astrophysical Journal Supplement Series, Vol: 907, Pages: 1-18, ISSN: 0067-0049

We report new observations toward the hyper-luminous dusty starbursting majormerger ADFS-27 (z=5.655), using ATCA and ALMA. We detect CO 2-1, 8-7, 9-8, 10-9and H2O(321-221) emission, and a P-Cygni-shaped OH+(11-01) absorption/emissionfeature. We also tentatively detect H2O(321-312) and OH+(12-01) emission andCH+(1-0) absorption. We find a total cold molecular mass of M_gas = (2.1+/-0.2)x 10^11 (alpha_CO/1.0) Msun. We also find that the excitation of thestar-forming gas is overall moderate for a z>5 dusty starburst, which isconsistent with its moderate dust temperature. A high density, high kinetictemperature gas component embedded in the gas reservoir is required to fullyexplain the CO line ladder. This component is likely associated with the"maximum starburst" nuclei in the two merging galaxies, which are separated byonly (140+/-13) km/s along the line of sight and 9.0 kpc in projection. Thekinematic structure of both components is consistent with galaxy disks, butthis interpretation remains limited by the spatial resolution of the currentdata. The OH+ features are only detected towards the northern component, whichis also the one that is more enshrouded in dust and thus remains undetected upto 1.6 um even in our sensitive new HST/WFC3 imaging. The absorption componentof the OH+ line is blueshifted and peaks near the CO and continuum emissionpeak while the emission is redshifted and peaks offset by 1.7 kpc from the COand continuum emission peak, suggesting that the gas is associated with amassive molecular outflow from the intensely star-forming nucleus that supplies125 Msun/yr of enriched gas to its halo.

Journal article

Dudzeviciute U, Smail I, Swinbank AM, Lim C-F, Wang W-H, Simpson JM, Ao Y, Chapman SC, Chen C-C, Clements D, Dannerbauer H, Ho LC, Hwang HS, Koprowski M, Lee C-H, Scott D, Shim H, Shirley R, Toba Yet al., 2021, Tracing the evolution of dust-obscured activity using sub-millimetre galaxy populations from STUDIES and AS2UDS, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 500, Pages: 942-961, ISSN: 0035-8711

Journal article

Clements DL, Serjeant S, Jin S, 2020, Explain ESA's late ditching of new space telescope, NATURE, Vol: 587, Pages: 548-548, ISSN: 0028-0836

Journal article

Shim H, Kim Y, Lee D, Lee HM, Goto T, Matsuhara H, Scott D, Serjeant S, Ao Y, Barrufet L, Chapman S, Clements DL, Conselice CJ, Greve TR, Hashimoto T, Hwang HS, Im M, Jeong W-S, Jiang L, Kim M, Kim SJ, Kong AKH, Koprowski M, Marchetti L, Michalowski MJ, Parsons H, Pearson C, Seo H, Toba Y, White Get al., 2020, NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-mu m map and catalogue of 850-mu m-selected sources over 2 deg(2), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 498, Pages: 5065-5079, ISSN: 0035-8711

Journal article

Greaves J, Richards A, Bains W, Rimmer P, Sagawa H, Clements D, Seager S, Petkowski J, Sousa-Silva C, Ranjan S, Drabek-Maunder E, Fraser H, Cartwright A, Muller-Wodarg I, Zhan Z, Friberg P, Coulson I, Lee E, Hoge Jet al., 2020, Phosphine gas in the cloud decks of Venus, Nature Astronomy, Vol: 5, Pages: 655-664, ISSN: 2397-3366

Measurements of trace gases in planetary atmospheres help us explore chemical conditions different to those on Earth. Our nearest neighbour, Venus, has cloud decks that are temperate but hyperacidic. Here we report the apparent presence of phosphine (PH3) gas in Venus’s atmosphere, where any phosphorus should be in oxidized forms. Single-line millimetre-waveband spectral detections (quality up to ~15σ) from the JCMT and ALMA telescopes have no other plausible identification. Atmospheric PH3 at ~20 ppb abundance is inferred. The presence of PH3 is unexplained after exhaustive study of steady-state chemistry and photochemical pathways, with no currently known abiotic production routes in Venus’s atmosphere, clouds, surface and subsurface, or from lightning, volcanic or meteoritic delivery. PH3 could originate from unknown photochemistry or geochemistry, or, by analogy with biological production of PH3 on Earth, from the presence of life. Other PH3 spectral features should be sought, while in situ cloud and surface sampling could examine sources of this gas.

Journal article

Bakx TJLC, Dannerbauer H, Frayer D, Eales SA, Perez-Fournon I, Cai Z-Y, Clements DL, De Zotti G, Gonzalez-Nuevo J, Ivison RJ, Lapi A, Michalowski MJ, Negrello M, Serjeant S, Smith MWL, Temi P, Urquhart S, van der Werf Pet al., 2020, IRAM 30-m-EMIR redshift search of z=3-4 lensed dusty starbursts selected from the HerBS sample, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 496, Pages: 2372-2390, ISSN: 0035-8711

Journal article

De Looze I, Lamperti I, Saintonge A, Relano M, Smith MWL, Clark CJR, Wilson CD, Decleir M, Jones AP, Kennicutt RC, Accurso G, Brinks E, Bureau M, Cigan P, Clements DL, De Vis P, Fanciullo L, Gao Y, Gear WK, Ho LC, Hwang HS, Michalowski MJ, Lee JC, Li C, Lin L, Liu T, Lomaeva M, Pan H-A, Sargent M, Williams T, Xiao T, Zhu Met al., 2020, JINGLE - IV. Dust, HI gas, and metal scaling laws in the local Universe, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 496, Pages: 3668-3687, ISSN: 0035-8711

Journal article

Greenslade J, Clements DL, Petitpas G, Asboth V, Conley A, Pérez-Fournon I, Riechers Det al., 2020, The nature of 500 micron risers I: SMA observations, Monthly Notices of the Royal Astronomical Society, Vol: 496, Pages: 2315-2333, ISSN: 0035-8711

We present SMA observations at resolutions from 0.35 to 3 arcsec of a sample of 34 candidate high redshift dusty star forming galaxies (DSFGs). These sources were selected from the HerMES Herschel survey catalogues to have SEDs rising from 250 to 350 to 500 μm, a population termed 500-risers. We detect counterparts to 24 of these sources, with four having two counterparts. We conclude that the remaining ten sources that lack detected counterparts are likely to have three or more associated sources which blend together to produce the observed Herschel source. We examine the role of lensing, which is predicted to dominate the brightest (F500 > 60 mJy) half of our sample. We find that while lensing plays a role, at least 35 per cent of the bright sources are likely to be multiple sources rather than the result of lensing. At fainter fluxes we find a blending rate comparable to, or greater than, the predicted 40 per cent. We determine far-IR luminosities and star formation rates for the non-multiple sources in our sample and conclude that, in the absence of strong lensing, our 500-risers are very luminous systems with LFIR > 1013 L⊙ and star formation rates >1000 M⊙ yr−1.

Journal article

Lim C-F, Chen C-C, Smail I, Wang W-H, Tee W-L, Lin Y-T, Scott D, Toba Y, Chang Y-Y, Ao Y, Babul A, Bunker A, Chapman SC, Clements DL, Conselice CJ, Gao Y, Greve TR, Ho LC, Hong SE, Hwang HS, Koprowski M, Michalowski MJ, Shim H, Shu X, Simpson JMet al., 2020, SCUBA-2 ultra deep imaging EAO survey (STUDIES). IV. spatial clustering and halo masses of submillimeter galaxies, The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 895, Pages: 1-18, ISSN: 0004-637X

We analyze an extremely deep 450 μm image (1σ = 0.56 mJy beam−1) of a sime300 arcmin2 area in the CANDELS/COSMOS field as part of the Sub-millimeter Common User Bolometric Array-2 Ultra Deep Imaging EAO Survey. We select a robust (signal-to-noise ratio ≥4) and flux-limited (≥4 mJy) sample of 164 submillimeter galaxies (SMGs) at 450 μm that have K-band counterparts in the COSMOS2015 catalog identified from radio or mid-infrared imaging. Utilizing this SMG sample and the 4705 K-band-selected non-SMGs that reside within the noise level ≤1 mJy beam−1 region of the 450 μm image as a training set, we develop a machine-learning classifier using K-band magnitude and color–color pairs based on the 13-band photometry available in this field. We apply the trained machine-learning classifier to the wider COSMOS field (1.6 deg2) using the same COSMOS2015 catalog and identify a sample of 6182 SMG candidates with similar colors. The number density, radio and/or mid-infrared detection rates, redshift and stellar-mass distributions, and the stacked 450 μm fluxes of these SMG candidates, from the S2COSMOS observations of the wide field, agree with the measurements made in the much smaller CANDELS field, supporting the effectiveness of the classifier. Using this SMG candidate sample, we measure the two-point autocorrelation functions from z = 3 down to z = 0.5. We find that the SMG candidates reside in halos with masses of sime(2.0 ± 0.5) × 1013 h −1 M ☉ across this redshift range. We do not find evidence of downsizing that has been suggested by other recent observational studies.

Journal article

Cheng T, Clements DL, Greenslade J, Cairns J, Andreani P, Bremer M, Conversi L, Cooray A, Dannerbauer H, De Zotti G, Eales S, Gonzalez-Nuevo J, Ibar E, Leeuw L, Ma J, Michalowski MJ, Nayyeri H, Riechers DA, Scott D, Temi P, Vaccari M, Valtchanov I, van Kampen E, Wang Let al., 2020, SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data, Monthly Notices of the Royal Astronomical Society, Vol: 494, Pages: 5985-5991, ISSN: 0035-8711

We measure the 850-μm source densities of 46 candidate protoclusters selected from the Planck high-z catalogue (PHz) and the Planck Catalogue of Compact Sources (PCCS) that were followed up with Herschel-SPIRE and SCUBA-2. This paper aims to search for overdensities of 850-μm sources in order to select the fields that are most likely to be genuine protoclusters. Of the 46 candidate protoclusters, 25 have significant overdensities (>5 times the field counts), 11 have intermediate overdensities (3–5 times the field counts), and 10 have no overdensity (<3 times the field counts) of 850-μm sources. We find that the enhanced number densities are unlikely to be the result of sample variance. Compared with the number counts of another sample selected from Planck’s compact source catalogues, this [PHz + PCCS]-selected sample has a higher fraction of candidate protoclusters with significant overdensities, though both samples show overdensities of 850-μm sources above intermediate level. Based on the estimated star formation rate densities (SFRDs), we suggest that both samples can efficiently select protoclusters with starbursting galaxies near the redshift at which the global field SFRD peaks (2 < z < 3). Based on the confirmation of overdensities found here, future follow-up observations on other PHz targets may greatly increase the number of genuine dusty star-forming galaxy-rich clusters/protoclusters.

Journal article

Bakx TJLC, Eales SA, Negrello M, Smith MWL, Valiante E, Holland WS, Baes M, Bourne N, Clements DL, Dannerbauer H, De Zotti G, Dunne L, Dye S, Furlanetto C, Ivison RJ, Maddox S, Marchetti L, Michalowski MJ, Omont A, Oteo I, Wardlow JL, van der Werf P, Yang Cet al., 2020, The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations (vol 473, pg 1751, 2018), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 494, Pages: 10-16, ISSN: 0035-8711

Journal article

Lim C-F, Wang W-H, Smail I, Scott D, Chen C-C, Chang Y-Y, Simpson JM, Toba Y, Shu X, Clements D, Greenslade J, Ao Y, Babul A, Birkin J, Chapman SC, Cheng T-A, Cho BS, Dannerbauer H, Dudzeviciute U, Dunlop J, Gao Y, Goto T, Ho LC, Hsu L-T, Hwang HS, Jeong W-S, Koprowski M, Lee C-H, Lin M-Y, Lin W-C, Michalowski MJ, Parsons H, Sawicki M, Shirley R, Shim H, Urquhart S, Wang J, Wang Tet al., 2020, SCUBA-2 ultra deep imaging EAO survey (studies). III. multiwavelength properties, luminosity functions, and preliminary source catalog of 450 mu m selected galaxies, The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 889, Pages: 1-33, ISSN: 0004-637X

We construct a SCUBA-2 450 μm map in the COSMOS field that covers an area of 300 arcmin2 and reaches a 1σ noise level of 0.65 mJy in the deepest region. We extract 256 sources detected at 450 μm with signal-to-noise ratios >4.0 and analyze the physical properties of their multiwavelength counterparts. We find that most of the sources are at z lesssim 3, with a median of $z={1.79}_{-0.15}^{+0.03} \% $. About ${35}_{-25}^{+32} \% $ of our sources are classified as starburst galaxies based on their total star formation rates (SFRs) and stellar masses (M *). By fitting the far-infrared spectral energy distributions, we find that our 450 μm selected sample has a wide range of dust temperatures (20 K lesssim T d lesssim 60 K), with a median of ${T}_{{\rm{d}}}={38.3}_{-0.9}^{+0.4}$ K. We do not find a redshift evolution in dust temperature for sources with ${L}_{\mathrm{IR}}\gt {10}^{12}\,{L}_{\odot }$ at z < 3. However, we find a moderate correlation where the dust temperature increases with the deviation from the SFR–M * relation. The increase in dust temperature also correlates with optical morphology, which is consistent with merger-triggered starbursts in submillimeter galaxies. Our galaxies do not show the tight IRX–β UV correlation that has been observed in the local universe. We construct the infrared luminosity functions of our 450 μm sources and measure their comoving SFR densities (SFRDs). The contribution of the ${L}_{\mathrm{IR}}\gt {10}^{12}\,{L}_{\odot }$ population to the SFRD rises dramatically from z = 0 to 2 (∝(1 + z)3.9±1.1) and dominates the total SFRD at z gsim 2.

Journal article

Duivenvoorden S, Oliver S, Bethermin M, Clements DL, De Zotti G, Efstathiou A, Farrah D, Hurley PD, Ivison RJ, Lagache G, Scott D, Shirley R, Wang L, Zemcov Met al., 2020, Have we seen all the galaxies that comprise the cosmic infrared background at 250 mu m <= lambda <= 500 mu m?, Monthly Notices of the Royal Astronomical Society, Vol: 491, Pages: 1355-1368, ISSN: 0035-8711

The cosmic infrared background (CIB) provides a fundamental observational constraint on the star formation history of galaxies over cosmic history. We estimate the contribution to the CIB from catalogued galaxies in the COSMOS field by using a novel map fitting technique on the Herschel SPIRE maps. Prior galaxy positions are obtained using detections over a large range in wavelengths in the Ks–3 GHz range. Our method simultaneously fits the galaxies, the system foreground, and the leakage of flux from galaxies located in masked areas and corrects for an ‘overfitting’ effect not previously accounted for in stacking methods. We explore the contribution to the CIB as a function of galaxy survey wavelength and depth. We find high contributions to the CIB with the deep r (mAB ≤ 26.5), Ks (mAB ≤ 24.0), and 3.6 μm (mAB ≤ 25.5) catalogues. We combine these three deep catalogues and find a total CIB contributions of 10.5 ± 1.6, 6.7 ± 1.5, and 3.1 ± 0.7 nWm−2 sr−1 at 250, 350, and 500 μm, respectively. Our CIB estimates are consistent with recent phenomenological models, prior based SPIRE number counts and with (though more precise than) the diffuse total measured by FIRAS. Our results raise the interesting prospect that the CIB contribution at λ≤500μm from known galaxies has converged. Future large-area surveys like those with the Large Synoptic Survey Telescope are therefore likely to resolve a substantial fraction of the population responsible for the CIB at 250 μm ≤ λ ≤ 500 μm.

Journal article

Kubo M, Toshikawa J, Kashikawa N, Chiang Y-K, Overzier R, Uchiyama H, Clements DL, Alexander DM, Matsuda Y, Kodama T, Ono Y, Goto T, Cheng T-A, Ito Ket al., 2019, Planck far-infrared detection of hyper suprime-cam protoclusters at z similar to 4: Hidden AGN and star formation activity, The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 887, Pages: 1-20, ISSN: 0004-637X

We perform a stacking analysis of Planck, AKARI, Infrared Astronomical Satellite, Wide-field Infrared Survey Explorer, and Herschel images of the largest number of (candidate) protoclusters at z ~ 3.8 selected from the Hyper Suprime-Cam Subaru Strategic Program. Stacking the images of the 179 candidate protoclusters, the combined infrared (IR) emission of the protocluster galaxies in the observed 12–850 μm wavelength range is successfully detected with >5σ significance (at Planck). This is the first time that the average IR spectral energy distribution (SED) of a protocluster has been constrained at z ~ 4. The observed IR SEDs of the protoclusters exhibit significant excess emission in the mid-IR compared to that expected from typical star-forming galaxies (SFGs). They are reproduced well using SED models of intense starburst galaxies with warm/hot dust heated by young stars, or by a population of active galactic nucleus (AGN)/SFG composites. For the pure star-forming model, a total IR (from 8–1000 μm) luminosity of ${19.3}_{-4.2}^{+0.6}\times {10}^{13}\,{L}_{\odot }$ and a star formation rate of ${16.3}_{-7.8}^{+1.0}\times {10}^{3}\,{M}_{\odot }$ yr−1 are found, whereas for the AGN/SFG composite model, ${5.1}_{-2.5}^{+2.5}\times {10}^{13}\,{L}_{\odot }$ and ${2.1}_{-1.7}^{+6.3}\times {10}^{3}\,{M}_{\odot }$ yr−1 are found. Uncertainty remains in the total SFRs; however, the IR luminosities of the most massive protoclusters are likely to continue increasing up to z ~ 4. Meanwhile, no significant IR flux excess is observed around optically selected QSOs at similar redshifts, which confirms previous results. Our results suggest that the z ~ 4 protoclusters trace dense, intensely star-forming environments that may also host obscured AGNs missed by the selection in the optical.

Journal article

Casey CM, Zavala JA, Aravena M, Bethermin M, Caputi K, Champagne JB, Clements DL, da Cunha E, Drew P, Finkelstein SL, Hayward CC, Kartaltepe JS, Knudsen K, Koekemoer AM, Magdis GE, Man A, Manning SM, Scoville NZ, Sheth K, Spilker J, Staguhn J, Talia M, Taniguchi Y, Toft S, Treister E, Yun Met al., 2019, Physical characterization of an unlensed, dusty star-forming galaxy at z=5.85, The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 887, Pages: 1-18, ISSN: 0004-637X

We present a physical characterization of MM J100026.36+021527.9 (a.k.a. "Mambo-9"), a dusty star-forming galaxy (DSFG) at z = 5.850 ± 0.001. This is the highest-redshift unlensed DSFG (and fourth most distant overall) found to date and is the first source identified in a new 2 mm blank-field map in the COSMOS field. Though identified in prior samples of DSFGs at 850 μm to 1.2 mm with unknown redshift, the detection at 2 mm prompted further follow-up as it indicated a much higher probability that the source was likely to sit at z > 4. Deep observations from the Atacama Large Millimeter and submillimeter Array (ALMA) presented here confirm the redshift through the secure detection of 12CO(J = 6→5) and p-H2O (21,1 → 20,2). Mambo-9 is composed of a pair of galaxies separated by 6 kpc with corresponding star formation rates of 590 M ⊙ yr−1 and 220 M ⊙ yr−1, total molecular hydrogen gas mass of (1.7 ± 0.4) × 1011 M ⊙, dust mass of (1.3 ± 0.3) × 109 M ⊙, and stellar mass of (${3.2}_{-1.5}^{+1.0}$) × 109 M ⊙. The total halo mass, (3.3 ± 0.8) × 1012 M ⊙, is predicted to exceed 1015 M ⊙ by z = 0. The system is undergoing a merger-driven starburst that will increase the stellar mass of the system tenfold in τ depl = 40−80 Myr, converting its large molecular gas reservoir (gas fraction of ${96}_{-2}^{+1} \% $) into stars. Mambo-9 evaded firm spectroscopic identification for a decade, following a pattern that has emerged for some of the highest-redshift DSFGs found. And yet, the systematic identification of unlensed DSFGs like Mambo-9 is key to measuring the global contribution of obscured star formation to the star formation rate density at z gsim 4, the formation of the first massive galaxies, and the formation of interstellar dust at early times (lesssim1 Gyr).

Journal article

Lamperti I, Saintonge A, De Looze I, Accurso G, Clark CJR, Smith MWL, Wilson CD, Brinks E, Brown T, Bureau M, Clements DL, Eales S, Glass DHW, Hwang HS, Lee JC, Lin L, Michalowski MJ, Sargent M, Williams TG, Xiao T, Yang Cet al., 2019, JINGLE - V. Dust properties of nearby galaxies derived from hierarchical Bayesian SED fitting, Monthly Notices of the Royal Astronomical Society, Vol: 489, Pages: 4389-4417, ISSN: 0035-8711

We study the dust properties of 192 nearby galaxies from the JINGLE survey using photometric data in the 22–850 μm range. We derive the total dust mass, temperature T, and emissivity index β of the galaxies through the fitting of their spectral energy distribution (SED) using a single modified blackbody model (SMBB). We apply a hierarchical Bayesian approach that reduces the known degeneracy between T and β. Applying the hierarchical approach, the strength of the T–β anticorrelation is reduced from a Pearson correlation coefficient R = −0.79 to R = −0.52. For the JINGLE galaxies we measure dust temperatures in the range 17−30 K and dust emissivity indices β in the range 0.6−2.2. We compare the SMBB model with the broken emissivity law modified blackbody (BMBB) and the two modified blackbody (TMBB) models. The results derived with the SMBB and TMBB are in good agreement, thus applying the SMBB, which comes with fewer free parameters, does not penalize the measurement of the cold dust properties in the JINGLE sample. We investigate the relation between T and β and other global galaxy properties in the JINGLE and Herschel Reference Survey (HRS) sample. We find that β correlates with the stellar mass surface density (R = 0.62) and anticorrelates with the H I mass fraction (MH I/M*, R = −0.65), whereas the dust temperature correlates strongly with the star formation rate normalized by the dust mass (R = 0.73). These relations can be used to estimate T and β in galaxies with insufficient photometric data available to measure them directly through SED fitting.

Journal article

Greenslade J, Aguilar E, Clements DL, Dannerbauer H, Cheng T, Petitpas G, Yang C, Messias H, Oteo I, Farrah D, Michalowski MJ, Fournon IP, Aretxaga I, Yun MS, Eales S, Dunne L, Cooray A, Andreani P, Hughes DH, Velazquez M, Sanchez-Arguelles D, Ponthieu Net al., 2019, A SCUBA-2 selected herschel-SPIRE dropout and the nature of this population, Publisher: arXiv

Dusty star-forming galaxies (DSFGs) detected at $z > 4$ provide importantexamples of the first generations of massive galaxies. However, few exampleswith spectroscopic confirmation are currently known, with Hershel struggling todetect significant numbers of $z > 6$ DSFGs. NGP6_D1 is a bright 850 $\mu m$source (12.3 $\pm$ 2.5 mJy) with no counterparts at shorter wavelengths (aSPIRE dropout). Interferometric observations confirm it is a single source,with no evidence for any optical or NIR emission, or nearby likely foregroundlensing sources. No $>3\sigma$ detected lines are seen in both LMT RSR and IRAM30m EMIR spectra of NGP6_D1 across 32 $GHz$ of bandwidth despite reachingdetection limits of $\sim 1 mJy/500 km~s^{-1}$, so the redshift remainsunknown. Template fitting suggests that NGP6_D1 is most likely between $z =5.8$ and 8.3. SED analysis finds that NGP6_D1 is a ULIRG, with a dust mass$\sim 10^8$ - $10^9$ $M_{\odot}$ and a SFR of $\sim$ 500 $M_{\odot}~yr^{-1}$.We place upper limits on the gas mass of NGP6_D1 of $M_{H2}$ $ < (1.1~\pm~3.5)\times 10^{11}$ $M_{\odot}$, consistent with a gas-to-dust ratio of $\sim$ 100- 1000. We discuss the nature of NGP6_D1 in the context of the broader submmpopulation, and find that comparable SPIRE dropouts account for $\sim$ 20% ofall SCUBA-2 detected sources, but with a similar flux density distribution tothe general population.

Working paper

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://wlsprd.imperial.ac.uk:80/respub/WEB-INF/jsp/search-html.jsp Request URI: /respub/WEB-INF/jsp/search-html.jsp Query String: respub-action=search.html&id=00341567&limit=30&person=true