Magdis, GE; Elbaz, D; Hwang, HS; Amblard, A; Arumugam, V; Aussel, H; Blain, A; ... Zemcov, M; + view all Magdis, GE; Elbaz, D; Hwang, HS; Amblard, A; Arumugam, V; Aussel, H; Blain, A; Bock, J; Boselli, A; Buat, V; Castro-Rodriguez, N; Cava, A; Chanial, P; Clements, DL; Conley, A; Conversi, L; Cooray, A; Dowell, CD; Dwek, E; Eales, S; Farrah, D; Franceschini, A; Glenn, J; Griffin, M; Halpern, M; Hatziminaoglou, E; Huang, J; Ibar, E; Isaak, K; Le Floc'h, E; Lagache, G; Levenson, L; Lonsdale, CJ; Lu, N; Madden, S; Maffei, B; Mainetti, G; Marchetti, L; Morrison, GE; Nguyen, HT; O'Halloran, B; Oliver, SJ; Omont, A; Owen, FN; Page, MJ; Pannella, M; Panuzzo, P; Papageorgiou, A; Pearson, CP; Perez-Fournon, I; Pohlen, M; Rigopoulou, D; Rizzo, D; Roseboom, IG; Rowan-Robinson, M; Schulz, B; Scott, D; Seymour, N; Shupe, DL; Smith, AJ; Stevens, JA; Strazzullo, V; Symeonidis, M; Trichas, M; Tugwell, KE; Vaccari, M; Valtchanov, I; Vigroux, L; Wang, L; Wright, G; Xu, CK; Zemcov, M; - view fewer (2010) Herschel reveals a Tdust-unbiased selection of z∼ 2 ultraluminous infrared galaxies. Monthly Notices of the Royal Astronomical Society , 409 (1) 22 - 28. 10.1111/j.1365-2966.2010.17551.x.

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Abstract

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∼ 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 μm. 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_sun) ≤ 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 μm), 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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