The far-infrared/submillimeter properties of galaxies located behind the Bullet cluster

M. Rex (1) , T. D. Rawle (2) , E. Egami (2) , P. G. Pérez-González (3) , M. Zemcov (4) , I. Aretxaga (4) , S. M. Chung (4) , D. Fadda (4) , A. H. Gonzalez (4) , D. H. Hughes (4) , C. Horellou (4) , D. Johansson (4) , J.-P. Kneib (5) , J. Richard (6) , B. Altieri (7) , A. K. Fiedler (4) , M. J. Pereira (2) , G. H. Rieke (2) , I. Smail (8) , I. Valtchanov (4) , A. W. Blain (9) , J. J. Bock (4) , F. Boone (10) , C. R. Bridge (9) , B. Clement (5) , F. Combes (11) , C. D. Dowell (4) , M. Dessauges-Zavadsky (12) , O. Ilbert (5) , R. J. Ivison (13) , M. Jauzac (5) , D. Lutz (14) , A. Omont (15) , R. Pelló (10) , G. Rodighiero (4) , D. Schaerer (10) , G. P. Smith (16, 17, 18) , G. L. Walth (2) , P. van Der Werf (19) , M. W. Werner (4) , J. E. Austermann (4) , H. Ezawa (4) , R. Kawabe (4) , K. Kohno (4) , T. A. Perera (4) , K. S. Scott (4) , G. W. Wilson (4) , M. S. Yun (4)

1 AWI - Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
2 Steward Observatory
3 Departamento de Física y Astronomía
4 AUTRES
5 LAM - Laboratoire d'Astrophysique de Marseille
6 CRAL - Centre de Recherche Astrophysique de Lyon
7 XMM-Newton Science Operations Centre
8 ICC - Institute for Computational Cosmology
9 Department of Astronomy
10 IRAP - Institut de recherche en astrophysique et planétologie
11 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
12 ObsGE - Observatoire Astronomique de l'Université de Genève
13 ROE - Royal Observatory Edinburgh
14 MPE - Max-Planck-Institut für Extraterrestrische Physik
15 IAP - Institut d'Astrophysique de Paris
16 UAB - University of Alabama at Birmingham [ Birmingham]
17 University of Bristol [Bristol]
18 UOR - University of Reading
19 Leiden Observatory [Leiden]

The Herschel Lensing Survey (HLS) takes advantage of gravitational lensing by massive galaxy clusters to sample a population of high-redshift galaxies which are too faint to be detected above the confusion limit of current far-infrared/submillimeter telescopes. Measurements from 100-500 μm bracket the peaks of the far-infrared spectral energy distributions of these galaxies, characterizing their infrared luminosities and star formation rates. We introduce initial results from our science demonstration phase observations, directed toward the Bullet cluster (1E0657-56). By combining our observations with LABOCA 870 μm and AzTEC 1.1 mm data we fully constrain the spectral energy distributions of 19 MIPS 24 μm-selected galaxies which are located behind the cluster. We find that their colors are best fit using templates based on local galaxies with systematically lower infrared luminosities. This suggests that our sources are not like local ultra-luminous infrared galaxies in which vigorous star formation is contained in a compact highly dust-obscured region. Instead, they appear to be scaled up versions of lower luminosity local galaxies with star formation occurring on larger physical scales. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Data presented in this paper were analyzed using "The Herschel interactive processing environment (HIPE)", a joint development by the Herschel Science Ground Segment Consortium, consisting of ESA, the NASA Herschel Science Center, and the HIFI, PACS, and SPIRE consortia.Table 1 and Figs. 3, 4 are only available in electronic form at http://www.aanda.org

Mots clés: infrared: galaxies; submillimeter: galaxies; galaxies: evolution; galaxies: high-redshift; galaxies: clusters: general; gravitational lensing: strong

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

M. Rex, T. D. Rawle, E. Egami, P. G. Pérez-González, M. Zemcov, et al.. The far-infrared/submillimeter properties of galaxies located behind the Bullet cluster. Astronomy and Astrophysics - A&A, 2010, 518, pp.L13. ⟨10.1051/0004-6361/201014693⟩. ⟨hal-00660716⟩