Herschel reveals a T-dust-unbiased selection of z similar to 2 ultraluminous infrared galaxies
| Title | Herschel reveals a T-dust-unbiased selection of z similar to 2 ultraluminous infrared galaxies |
| Publication Type | Journal Article |
| Year of Publication | 2010 |
| Authors | 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 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 409 |
| Pagination | 22-28 |
| Date Published | Nov |
| ISBN Number | 0035-8711 |
| Accession Number | WOS:000284285500003 |
| 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 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. |
