The Herschel census of infrared SEDs through cosmic time
MetadataShow full item record
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.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
A redshift survey of herschel far-infrared selected starbursts and implications for obscured star formationCasey, C.; Berta, S.; Béthermin, M.; Bock, J.; Bridge, C.; Budynkiewicz, J.; Burgarella, D.; Chapin, E.; Chapman, S.; Clements, D.; Conley, A.; Conselice, C.; Cooray, A.; Farrah, D.; Hatziminaoglou, E.; Ivison, R.; Le Floc'h, E.; Lutz, D.; Magdis, G.; Magnelli, B.; Oliver, S.; Page, M.; Pozzi, F.; Rigopoulou, D.; Riguccini, L.; Roseboom, I.; Sanders, D.; Scott, D.; Seymour, Nick; Valtchanov, I.; Vieira, J.; Viero, M.; Wardlow, J. (2012)We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500 μm, taken with the Keck I Low Resolution Imaging Spectrometer and the Keck II DEep ...
Symeonidis, M.; Oates, S.; de Pasquale, M.; Page, M.; Wiersema, K.; Starling, R.; Schady, P.; Seymour, Nick; O'Halloran, B. (2014)We present Herschel/PACS observations of the nearby (z = 0.1055) dwarf galaxy that has hosted the long gamma-ray burst (LGRB) 031203. Using the PACS data, we have been able to place constraints on the dust temperature, ...
Symeonidis, M.; Page, M.; Seymour, Nick; Dwelly, T.; Coppin, K.; McHardy, I.; Rieke, G.; Huynh, M. (2009)We show that the far-IR properties of distant Luminous and UltraLuminous InfraRed Galaxies (LIRGs and ULIRGs, respectively) are on average divergent from analogous sources in the local Universe. Our analysis is based on ...