Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 409, Issue 1, Pages 22-28Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17551.x
Keywords
galaxies: evolution; galaxies: high-redshift; galaxies: starburst; cosmology: observations; infrared: galaxies; submillimetre: galaxies
Categories
Funding
- CSA (Canada)
- NAOC (China)
- CEA (France)
- CNES (France)
- CNRS (France)
- ASI (Italy)
- MCINN (Spain)
- SNSB (Sweden)
- STFC (UK)
- NASA (USA)
- STFC [ST/G002630/1, ST/H002456/1, ST/H00260X/1, ST/F007019/1, ST/F002858/1, PP/E005306/1, ST/H001530/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H00260X/1, PP/E005306/1, ST/G002630/1, ST/F007019/1, ST/F002858/1, ST/H002456/1, PP/E001181/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1] Funding Source: researchfish
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Using Herschel Photodetector Array Camera (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) observations of Lockman Hole-North and Great Observatories Origins Deep Survey-North (GOODS-N) as part of the Herschel Multi-tiered Extragalactic Survey (HerMES) project, we explore the far-infrared (IR) properties of a sample of mid-IR-selected starburst-dominated ultraluminous infrared galaxies (ULIRGs) at z similar to 2. The selection of the sample is based on the detection of the stellar bump that appears in the spectral energy distribution of star-forming galaxies at 1.6 mu m. We derive robust estimates of infrared luminosities (L-IR) and dust temperatures (T-d) of the population and find that while the luminosities in our sample span less than an order of magnitude (12.24 <= log(L-IR/L-circle dot) <= 12.94), they cover a wide range of dust temperatures (25 <= T-d <= 62 K). Galaxies in our sample range from those that are as cold as high-z submillimetre galaxies (SMGs) to those that are as warm as optically faint radio galaxies (OFRGs) and local ULIRGs. Nevertheless, our sample has median T-d = 42.3 K, filling the gap between SMGs and OFRGs, bridging the two populations. We demonstrate that a significant fraction of our sample would be missed from ground-based (sub) mm surveys (850-1200 mu m), showing that the latter introduce a bias towards the detection of colder sources. We conclude that Herschel observations confirm the existence of high-z ULIRGs warmer than SMGs, show that the mid-IR selection of high-z ULIRGs is not T-d dependent, reveal a large dispersion in T-d of high-z ULIRGs and provide the means to characterize the bulk of the ULIRG population, free from selection biases introduced by ground-based (sub) mm surveys.
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