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 {mu}m) >80 {mu}Jy and i {sup +} < 24 in the COSMOS field. We exploit the accurate photometric redshifts in COSMOS to characterize th...

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Bibliographic Details
Published in:The Astrophysical journal 2010-09, Vol.721 (1), p.607-614
Main Authors: Feruglio, C, Aussel, H, Le Floc'h, E, Ilbert, O, Salvato, M, Capak, P, Fiore, F, Kartaltepe, J, Sanders, D, Scoville, N, Koekemoer, A. M, Ideue, Y
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Earth, ocean, space
EVOLUTION
Exact sciences and technology
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
LUMINOSITY
MASS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RED SHIFT
STARS
UNIVERSE
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Summary: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 {mu}m) >80 {mu}Jy and i {sup +} < 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 {approx} 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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/721/1/607