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Published September 20, 2010 | Published
Journal Article Open

Obscured Star Formation and Environment in the COSMOS Field


We investigate the effects of the environment on star formation in a sample of massive luminous and ultra-luminous infrared galaxies (LIRGs and ULIRGs) with S(24 μm) >80 μJy and i ^+ < 24 in the COSMOS field. We exploit the accurate photometric redshifts in COSMOS to characterize the galaxy environment and study the evolution of the fraction of LIRGs and ULIRGs in different environments in the redshift range z = 0.3-1.2 and in bins of stellar mass. We find that the environment plays a role in the star formation processes and evolution of LIRGs and ULIRGs. We find an overall increase of the ULIRG+LIRG fraction in an optically selected sample with increasing redshift, as expected from the evolution of the star formation rate (SFR) density. We find that the ULIRG+LIRG fraction decreases with increasing density up to z ~ 1, and that the dependence on density flattens with increasing redshift. We do not observe the reversal of the SFR density relation up to z = 1 in massive LIRGs and ULIRGs, suggesting that such reversal might occur at higher redshift in this infrared luminosity range.

Additional Information

© 2010 The American Astronomical Society. Received 2009 May 2; accepted 2010 July 7; published 2010 August 31. This work is based on observations made with the Spitzer Space Observatory, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology under NASA contract 1407. Support for this work was provided by ANR "DSIGALE" ANR-06-BLAN-0170 grant. Support for this work was provided in part by NASA through contracts 1282612 and 1298231 issued by the JPL, and grants 1289085 and 1310136. We thank the anonymous referee for carefully reading and providing useful suggestions that improved the paper.

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Published - Feruglio2010p11583Astrophys_J.pdf


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