Deep Herschel view of obscured star formation in the Bullet cluster
Abstract
We use deep, five band (100-500um) 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 Msun yr-1. On average, the background system contains brighter far-infrared (FIR) galaxies, with ~50% higher SFRFIR (21 galaxies; 207 +/- 9 Msun yr-1). SFRs extrapolated from 24um flux via recent templates (SFR24) agree well with SFRFIR for ~60% of the cluster galaxies. In the remaining ~40%, SFR24 underestimates SFRFIR due to a significant excess in observed S100/S24 (rest frame S75/S18) compared to templates of the same FIR luminosity.
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