The SCUBA Half Degree Extragalactic Survey (SHADES) - IX. The environment, mass and redshift dependence of star formation

S. Serjeant, S. Dye, A. Mortier, J. Peacock, E. Egami, M. Cirasuolo, G. Rieke, C. Borys, S. Chapman, D. Clements, K. Coppin, J. Dunlop, S. Eales, D. Farrah, M. Halpern, P. Mauskopf, A. Pope, M. Rowan-Robinson, D. Scott, I. SmailM. Vaccari

Research output: Contribution to journalArticlepeer-review

Abstract

We present a comparison between the SCUBA (Submillimetre Common User Bolometer Array) Half Degree Extragalactic Survey (SHADES) at 450 and 850μm in the Lockman Hole East with a deep Spitzer Space Telescope survey at 3.6-24μm conducted in guaranteed time. Using stacking analyses we demonstrate a striking correspondence between the galaxies contributing the submm extragalactic background light, with those likely to dominate the backgrounds at Spitzer wavelengths. Using a combination BRIzK plus Spitzer photometric redshifts, we show that at least a third of the Spitzer-identified submm galaxies at 1 <z <1.5 appear to reside in overdensities when the density field is smoothed at 0.5-2Mpc comoving diameters, supporting the high-redshift reversal of the local star formation-galaxy density relation. We derive the dust-shrouded cosmic star formation history of galaxies as a function of assembled stellar masses. For model stellar masses and specific star formation rates are in striking disagreement with some semi-analytic predictions from the Millenium Simulation. The discrepancy could either be resolved with a top-heavy initial mass function, or a significant component of the submm flux heated by the interstellar radiation field.
Original languageEnglish
Pages (from-to)1907-1921
JournalMonthly Notices of the Royal Astronomical Society
Volume386
DOIs
Publication statusPublished - 1 Jun 2008

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