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23 April 2024

» arxiv » 1005.3822

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Deep Herschel view of obscured star formation in the Bullet cluster
T.D. Rawle ; S.M. Chung ; D. Fadda ; M. Rex ; E. Egami ; P.G. Pérez-González ; B. Altieri ; A.W. Blain ; C.R. Bridge ; A.K. Fiedler ; A.H. Gonzalez ; M.J. Pereira ; J. Richard ; I. Smail ; I. Valtchanov ; M. Zemcov ; P.N. Appleton ; J.J. Bock ; F. Boone ; B. Clement ; F. Combes ; C.D. Dowell ; M. Dessauges-Zavadsky ; O. Ilbert ; R.J. Ivison ; M. Jauzac ; J.-P. Kneib ; D. Lutz ; R. Pelló ; G.H. Rieke ; G. Rodighiero ; D. Schaerer ; G.P. Smith ; G.L. Walth ; P. van der Werf ; M.W. Werner ;
Date:	20 May 2010
Abstract:	We use deep, five band (100-500um) data from the Herschel Lensing Survey (HLS) to fully constrain the obscured star formation rate, SFR_FIR, 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 SFR_FIR = 144 +/- 14 M_sun yr^-1. On average, the background system contains brighter far-infrared (FIR) galaxies, with ~50% higher SFR_FIR (21 galaxies; 207 +/- 9 M_sun yr^-1). SFRs extrapolated from 24um flux via recent templates (SFR_24) agree well with SFR_FIR for ~60% of the cluster galaxies. In the remaining ~40%, SFR_24 underestimates SFR_FIR due to a significant excess in observed S_100/S_24 (rest frame S_75/S_18) compared to templates of the same FIR luminosity.
Source:	arXiv, 1005.3822
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