Imperial College London

Dr Clements

Faculty of Natural SciencesDepartment of Physics

Reader in Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7693d.clements

 
 
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Location

 

1011Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

672 results found

Borsato E, Marchetti L, Negrello M, Corsini EM, Wake D, Amvrosiadis A, Baker AJ, Bakx TJLC, Beelen A, Berta S, Beyer A, Clements DL, Cooray A, Cox P, Dannerbauer H, de Zotti G, Dye S, Eales SA, Enia A, Farrah D, Gonzalez-Nuevo J, Hughes DH, Ismail D, Jin S, Lapi A, Lehnert MD, Neri R, Pérez-Fournon I, Riechers DA, Rodighiero G, Scott D, Serjeant S, Stanley F, Urquhart S, van der Werf P, Vaccari M, Wang L, Yang C, Young Aet al., 2024, Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations, Monthly Notices of the Royal Astronomical Society, Vol: 528, Pages: 6222-6279, ISSN: 0035-8711

We have carried out Hubble Space Telescope (HST) snapshot observations at 1.1 μm of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel Space Observatory. Our candidates comprise systems with flux densities at 500 μm, S500 ≥ 80 mJy. We model and subtract the surface brightness distribution for 130 systems, where we identify a candidate for the foreground lens candidate. After combining visual inspection, archival high-resolution observations, and lens subtraction, we divide the systems into different classes according to their lensing likelihood. We confirm 65 systems to be lensed. Of these, 30 are new discoveries. We successfully perform lens modelling and source reconstruction on 23 systems, where the foreground lenses are isolated galaxies and the background sources are detected in the HST images. All the systems are successfully modelled as a singular isothermal ellipsoid. The Einstein radii of the lenses and the magnifications of the background sources are consistent with previous studies. However, the background source circularized radii (between 0.34 and 1.30 kpc) are ∼3 times smaller than the ones measured in the sub-millimetre/millimetre for a similarly selected and partially overlapping sample. We compare our lenses with those in the Sloan Lens Advanced Camera for Surveys (ACS) Survey confirming that our lens-independent selection is more effective at picking up fainter and diffuse galaxies and group lenses. This sample represents the first step towards characterizing the near-infrared properties and stellar masses of the gravitationally lensed dusty star-forming galaxies.

Journal article

Pearson J, Serjeant S, Wang WH, Gao ZK, Babul A, Chapman S, Chen CC, Clements DL, Conselice CJ, Dunlop J, Fan L, Ho LC, Hwang HS, Koprowski M, Michałowski M, Shim Het al., 2024, A large population of strongly lensed faint submillimetre galaxies in future dark energy surveys inferred from JWST imaging, Monthly Notices of the Royal Astronomical Society, Vol: 527, Pages: 12044-12052, ISSN: 0035-8711

Bright galaxies at submillimetre wavelengths from Herschel are now well known to be predominantly strongly gravitationally lensed. The same models that successfully predicted this strongly lensed population also predict about 1 per cent of faint 450 μm-selected galaxies from deep James Clerk Maxwell Telescope (JCMT) surveys will also be strongly lensed. Follow-up ALMA campaigns have so far found one potential lens candidate, but without clear compelling evidence, for example, from lensing arcs. Here, we report the discovery of a compelling gravitational lens system confirming the lensing population predictions, with a zs = 3.4 ± 0.4 submm source lensed by a zspec = 0.360 foreground galaxy within the COSMOS field, identified through public JWST imaging of a 450 μm source in the SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) catalogue. These systems will typically be well within the detectable range of future wide-field surveys such as Euclid and Roman, and since submillimetre galaxies are predominantly very red at optical/near-infrared wavelengths, they will tend to appear in near-infrared channels only. Extrapolating to the Euclid-Wide survey, we predict tens of thousands of strongly lensed near-infrared galaxies. This will be transformative for the study of dusty star-forming galaxies at cosmic noon, but will be a contaminant population in searches for strongly lensed ultra-high-redshift galaxies in Euclid and Roman.

Journal article

Greaves JS, Petkowski JJ, Richards AMS, Sousa-Silva C, Seager S, Clements DLet al., 2023, Comment on “Phosphine in the Venusian Atmosphere: A Strict Upper Limit From SOFIA GREAT Observations” by Cordiner et al., Geophysical Research Letters, Vol: 50, ISSN: 0094-8276

Searches for phosphine in Venus' atmosphere have sparked a debate. Cordiner et al. (2022, https://doi.org/10.1029/2022gl101055) analyze spectra from the Stratospheric Observatory For Infrared Astronomy (SOFIA) and infer <0.8 ppb of PH3. We noticed that some spectral artifacts arose from non-essential calibration-load signals. By-passing these signals allows simpler post-processing and a 5.7σ candidate detection, suggesting ∼3 ppb of PH3 above the clouds. Compiling six phosphine results hints at an inverted abundance trend: decreasing above the clouds but rising again in the mesosphere from some unexplained source. However, no such extra source is needed if phosphine is undergoing destruction by sunlight (photolysis), to a similar degree as on Earth. Low phosphine values/limits are found where the viewed part of the super-rotating Venusian atmosphere had passed through sunlight, while high values are from views moving into sunlight. We suggest Venusian phosphine is indeed present, and so merits further work on models of its origins.

Journal article

Garratt TK, Geach JE, Tamura Y, Coppin KEK, Franco M, Ao Y, Chen C-C, Cheng C, Clements DL, Dai YS, Dannerbauer H, Greve TR, Hatsukade B, Hwang HS, Jiang L, Kohno K, Koprowski MP, Michalowski MJ, Sawicki M, Scott D, Shim H, Takeuchi TT, Wang W-H, Xue YQ, Yang Cet al., 2023, The SCUBA-2 Large eXtragalactic Survey: 850μm map, catalogue and the bright-end number counts of the XMM-LSS field, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 520, Pages: 3669-3687, ISSN: 0035-8711

Journal article

Farrah D, Croker KS, Zevin M, Tarle G, Faraoni V, Petty S, Afonso J, Fernandez N, Nishimura KA, Pearson C, Wang L, Clements DL, Efstathiou A, Hatziminaoglou E, Lacy M, McPartland C, Pitchford LK, Sakai N, Weiner Jet al., 2023, Observational Evidence for Cosmological Coupling of Black Holes and its Implications for an Astrophysical Source of Dark Energy, ASTROPHYSICAL JOURNAL LETTERS, Vol: 944, ISSN: 2041-8205

Journal article

Farrah D, Petty S, Croker KSS, Tarle G, Zevin M, Hatziminaoglou E, Shankar F, Wang L, Clements DL, Efstathiou A, Lacy M, Nishimura KA, Afonso J, Pearson C, Pitchford LKet al., 2023, A Preferential Growth Channel for Supermassive Black Holes in Elliptical Galaxies at <i>z</i> ≲ 2, ASTROPHYSICAL JOURNAL, Vol: 943, ISSN: 0004-637X

Journal article

Cramer WJ, Noble AG, Massingill K, Cairns J, Clements DL, Cooper MC, Demarco R, Matharu J, McDonald M, Muzzin A, Nantais J, Rudnick G, uebler H, van Kampen E, Webb TMA, Wilson G, Yee HKCet al., 2023, A Large-scale Kinematic Study of Molecular Gas in High-<i>z</i> Cluster Galaxies: Evidence for High Levels of Kinematic Asymmetry, ASTROPHYSICAL JOURNAL, Vol: 944, ISSN: 0004-637X

Journal article

Cairns J, Clements DL, Greenslade J, Petitpas G, Cheng T, Ding Y, Parmar A, Perez-Fournon I, Riechers Det al., 2023, The nature of 500 micron risers - II. Multiplicities and environments of sub-mm faint dusty star-forming galaxies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 519, Pages: 709-728, ISSN: 0035-8711

Journal article

Farrah D, Efstathiou A, Afonso J, Clements DL, Croker K, Hatziminaoglou E, Joyce M, Lebouteiller V, Lee A, Lonsdale C, Pearson C, Petty S, Pitchford LK, Rigopoulou D, Verma A, Wang Let al., 2023, Molecular Gas Heating, Star Formation Rate Relations, and AGN Feedback in Infrared-Luminous Galaxy Mergers, UNIVERSE, Vol: 9

Journal article

Gao F, Wang L, Ramos Padilla AF, Clements D, Farrah D, Huang Tet al., 2022, Probing the megaparsec-scale environment of hyperluminous infrared galaxies at 2 &lt; <i>z</i> &lt; 4, ASTRONOMY & ASTROPHYSICS, Vol: 668, ISSN: 0004-6361

Journal article

Clements DLL, 2022, Venus, phosphine and the possibility of life, CONTEMPORARY PHYSICS, Vol: 63, Pages: 180-199, ISSN: 0010-7514

Journal article

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

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

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-μm 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

Klyce W, Suresh KV, Jain A, Parent S, Shah SA, Cahill PJ, George S, Clements D, Upasani S, Yaszay B, Miyanji F, Kelly MP, Lonner BS, Sponseller PDet al., 2022, Pedicle Screw Plowing in Adolescent Idiopathic Scoliosis How Common Is It and Is It a Problem?, SPINE, Vol: 47, Pages: 873-878, ISSN: 0362-2436

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 <i>z</i> &lt; 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

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

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

Shaikh F, Dar S, Shenderey R, West S, Gracey-Whitman L, Zakaria A, Shaikh F, Healey C, Clements Det al., 2021, FAECAL ELASTASE MAY HAVE A ROLE IN THE INVESTIGATION OF IRON DEFICIENCY ANAEMIA, Publisher: BMJ PUBLISHING GROUP, Pages: A204-A204, ISSN: 0017-5749

Conference paper

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

Sufian AT, Abdullah BM, Ateeq M, Wah R, Clements Det al., 2021, Six-Gear Roadmap towards the Smart Factory, APPLIED SCIENCES-BASEL, Vol: 11

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 <i>Spitzer</i> 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

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