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The Herschel census of infrared SEDs through cosmic time

journal contribution
posted on 2023-06-08, 14:50 authored by M Symeonidis, M Vaccari, S Berta, M J Page, D Lutz, V Arumugam, H Aussel, J Bock, A Boselli, V Buat, P L Capak, D L Clements, A Conley, L Conversi, A Cooray, C D Dowell, D Farrah, A Franceschini, E Giovannoli, J Glenn, M Griffin, E Hatziminaoglou, H-S Hwang, E Ibar, O Ilbert, R J Ivison, E Le Floc'h, S Lilly, J S Kartaltepe, B Magnelli, G Magdis, L Marchetti, H T Nguyen, R Nordon, B O'Halloran, Seb OliverSeb Oliver, A Omont, A Papageorgiou, H Patel, C P Pearson, I Pérez-Fournon, M Pohlen, P Popesso, F Pozzi, D Rigopoulou, L Riguccini, D Rosario, I G Roseboom, M Rowan-Robinson, M Salvato, B Schulz, Douglas Scott, N Seymour-Smith, D L Shupe, A J Smith, I Valtchanov, L Wang, C K Xu, M Zemcov, S Wuyts
Using Herschel data from the deepest SPIRE and PACS surveys (HerMES and PEP) in COSMOS, GOODS-S and GOODS-N, we examine the dust properties of infrared (IR)-luminous (LIR > 1010 L?) galaxies at 0.1 < z < 2 and determine how these evolve with cosmic time. The unique angle of this work is the rigorous analysis of survey selection effects, making this the first study of the star-formation-dominated, IR-luminous population within a framework almost entirely free of selection biases. We find that IR-luminous galaxies have spectral energy distributions (SEDs) with broad far-IR peaks characterized by cool/extended dust emission and average dust temperatures in the 25–45 K range. Hot (T > 45?K) SEDs and cold (T < 25?K), cirrus-dominated SEDs are rare, with most sources being within the range occupied by warm starbursts such as M82 and cool spirals such as M51. We observe a luminosity–temperature (L-T) relation, where the average dust temperature of log [LIR/L?] ~ 12.5 galaxies is about 10 K higher than that of their log [LIR/L?] ~ 10.5 counterparts. However, although the increased dust heating in more luminous systems is the driving factor behind the L-T relation, the increase in dust mass and/or starburst size with luminosity plays a dominant role in shaping it. Our results show that the dust conditions in IR-luminous sources evolve with cosmic time: at high redshift, dust temperatures are on average up to 10 K lower than what is measured locally (z ? 0.1). This is manifested as a flattening of the L-T relation, suggesting that (ultra)luminous infrared galaxies [(U)LIRGs] in the early Universe are typically characterized by a more extended dust distribution and/or higher dust masses than local equivalent sources. Interestingly, the evolution in dust temperature is luminosity dependent, with the fraction of LIRGs with T < 35 K showing a two-fold increase from z ~ 0 to z ~ 2, whereas that of ULIRGs with T < 35 K shows a six-fold increase. Our results suggest a greater diversity in the IR-luminous population at high redshift, particularly for ULIRGs.

History

Publication status

  • Published

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Royal Astronomical Society

Issue

3

Volume

431

Page range

2317-2340

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2013-05-01

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