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.
@article{arxiv.1005.3822,
title = {Deep Herschel view of obscured star formation in the Bullet cluster},
author = {T. D. Rawle and S. M. Chung and D. Fadda and M. Rex and E. Egami and P. G. Pérez-González and B. Altieri and A. W. Blain and C. R. Bridge and A. K. Fiedler and A. H. Gonzalez and M. J. Pereira and J. Richard and I. Smail and I. Valtchanov and M. Zemcov and P. N. Appleton and J. J. Bock and F. Boone and B. Clement and F. Combes and C. D. Dowell and M. Dessauges-Zavadsky and O. Ilbert and R. J. Ivison and M. Jauzac and J. -P. Kneib and D. Lutz and R. Pelló and G. H. Rieke and G. Rodighiero and D. Schaerer and G. P. Smith and G. L. Walth and P. van der Werf and M. W. Werner},
journal= {arXiv preprint arXiv:1005.3822},
year = {2015}
}
Comments
Accepted for publication in Astronomy and Astrophysics (Herschel Special Issue)