The far-infrared/submillimeter properties of galaxies located behind the Bullet cluster Article - Juillet 2010

M. Rex, T. D. Rawle, E. Egami, P. G. Pérez-González, M. Zemcov, I. Aretxaga, S. M. Chung, D. Fadda, A. H. Gonzalez, D. H. Hughes, C. Horellou, D. Johansson, J.-P. Kneib, J. Richard, B. Altieri, A. K. Fiedler, M. J. Pereira, G. H. Rieke, I. Smail, I. Valtchanov, A. W. Blain, J. J. Bock, F. Boone, C. R. Bridge, B. Clement, F. Combes, C. D. Dowell, M. Dessauges-Zavadsky, O. Ilbert, R. J. Ivison, M. Jauzac, D. Lutz, A. Omont, R. Pelló, G. Rodighiero, D. Schaerer, G. P. Smith, G. L. Walth, P. van der Werf, M. W. Werner, J. E. Austermann, H. Ezawa, R. Kawabe, K. Kohno, T. A. Perera, K. S. Scott, G. W. Wilson, M. S. Yun

M. Rex, T. D. Rawle, E. Egami, P. G. Pérez-González, M. Zemcov, I. Aretxaga, S. M. Chung, D. Fadda, A. H. Gonzalez, D. H. Hughes, C. Horellou, D. Johansson, J.-P. Kneib, J. Richard, B. Altieri, A. K. Fiedler, M. J. Pereira, G. H. Rieke, I. Smail, I. Valtchanov, A. W. Blain, J. J. Bock, F. Boone, C. R. Bridge, B. Clement, F. Combes, C. D. Dowell, M. Dessauges-Zavadsky, O. Ilbert, R. J. Ivison, M. Jauzac, D. Lutz, A. Omont, R. Pelló, G. Rodighiero, D. Schaerer, G. P. Smith, G. L. Walth, P. van der Werf, M. W. Werner, J. E. Austermann, H. Ezawa, R. Kawabe, K. Kohno, T. A. Perera, K. S. Scott, G. W. Wilson, M. S. Yun, « The far-infrared/submillimeter properties of galaxies located behind the Bullet cluster  », Astronomy and Astrophysics - A&A, juillet 2010, L13. ISSN 0004-6361

Abstract

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

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