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Deep Herschel view of obscured star formation in the Bullet cluster.

Rawle, T.D. and Chung, S.M. and Fadda, D. and Rex, M. and Egami, E. and Pérez-González, P.G. and Altieri, B. and Blain, A.W. and Bridge, C.R. and Fiedler, A.K. and Gonzalez, A.H. and Pereira, M.J. and Richard, J. and Smail, I. and Valtchanov, I. and Zemcov, M. and Appleton, P.N. and Bock, J.J. and Boone, F. and Clement, B. and Combes, F. and Dowell, C.D. and Dessauges-Zavadsky, M. and Ilbert, O. and Ivison, R.J. and Jauzac, M. and Kneib, J.-P. and Lutz, D. and Pelló, R. and Rieke, G.H. and Rodighiero, G. and Schaerer, D. and Smith, G.P. and Walth, G.L. and van der Werf, P. and Werner, M.W. (2010) 'Deep Herschel view of obscured star formation in the Bullet cluster.', Astronomy & astrophysics., 518 . L14.


We use deep, five band (100–500 μm) data from the Herschel Lensing Survey (HLS) to fully constrain the obscured star formation rate, SFRFIR, of galaxies in the Bullet cluster (z = 0.296), and a smaller background system (z = 0.35) in the same field. Herschel detects 23 Bullet cluster members with a total SFRFIR = 144±14 yr-1. On average, the background system contains brighter far-infrared (FIR) galaxies, with ~50% higher SFRFIR (21 galaxies; 207± 9 yr-1). SFRs extrapolated from 24 μm flux via recent templates (SFR24 µm) agree well with SFRFIR for ~60% of the cluster galaxies. In the remaining ~40%, SFR24 µm underestimates SFRFIR due to a significant excess in observed S100/S24 (rest frame S75/S18) compared to templates of the same FIR luminosity.

Item Type:Article
Keywords:Galaxies, Clusters, Bullet cluster, Star formation, Infrared, Submillimeter.
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Date accepted:No date available
Date deposited:14 June 2013
Date of first online publication:July 2010
Date first made open access:No date available

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