OBSCURED STAR FORMATION AND ENVIRONMENT IN THE COSMOS FIELD

Journal Article · Mon Sep 20 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/721/1/607· OSTI ID:21464831

Feruglio, C; Aussel, H ^[1]; Le Floc'h, E; Kartaltepe, J; Sanders, D ^[2]; Ilbert, O ^[3]; Salvato, M; Capak, P; Scoville, N ^[4]; Fiore, F ^[5]; Koekemoer, A M ^[6]; Ideue, Y ^[7]

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1. DSM/Irfu/Service d'Astrophysique, CEA Saclay, F 91 191 Gif-sur-Yvette (France)
2. Institute for Astronomy, 2680 Woodlawn Drive, University of Hawaii, Honolulu, HI 96822 (United States)
3. Observatoriore de Marseille-Provence, Pole de l'Etoile Site de Chateau-Gombert, 38 rue Frederic Joliot-Curie, 13388 Marseille cedex 13 (France)
4. California Institute of Technology, MS 105-24, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
5. INAF-Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Italy)
6. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
7. Ehime University, Dogo-himata 10-13, Matsuyama City, Ehime Prefecture 790-8577 (Japan)

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.

• OSTI ID: 21464831
• Journal Information: Astrophysical Journal, Vol. 721, Issue 1; Other Information: DOI: 10.1088/0004-637X/721/1/607; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
LUMINOSITY
MASS
RED SHIFT
STARS
UNIVERSE
EVOLUTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES