Journal
ASTROPHYSICAL JOURNAL
Volume 690, Issue 2, Pages 1074-1083Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/690/2/1074
Keywords
galaxies: evolution; galaxies: starburst
Categories
Funding
- NASA [NAS 5-26555]
- National Astronomical Observatory of Japan
- XMM-Newton
- ESA Member States
- European Southern Observatory [175.A-0839]
- Kitt Peak National Observatory
- Cerro Tololo Inter-American Observatory
- National Optical Astronomy Observatory
- Association of Universities for Research in Astronomy, Inc. ( AURA)
- National Science Foundation
- CFHT Corporation
- National Research Council of Canada
- Canadian Astronomy Data Centre
- Centre National de la Recherche Scientifique de France
- TERAPIX
- University of Hawaii
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For a mass-selected sample of 66544 galaxies with photometric redshifts (z(phot)) from the Cosmic Evolution Survey (COSMOS), we examine the evolution of star-formation activity as a function of stellar mass in galaxies. We estimate the cosmic star-formation rates (SFRs) over the range 0.2 < z(phot) < 1.2, using the rest-frame 2800 angstrom flux (corrected for extinction). We find the mean SFR to be a strong function of the galactic stellar mass at any given redshift, with massive systems (log(M/M(circle dot)) > 10.5) contributing less (by a factor of similar to 5) to the total star-formation rate density (SFRD). Combining data from the COSMOS and Gemini Deep Deep Survey, we extend the SFRD-z relation as a function of stellar mass to z similar to 2. For massive galaxies, we find a steep increase in the SFRD-z relation to z similar to 2; for the less-massive systems, the SFRD which also increases from z = 0 to 1 levels off at z similar to 1. This implies that the massive systems have had their major star-formation activity at earlier epochs (z > 2) than the lower-mass galaxies. We study changes in the SFRDs as a function of both redshift and stellar mass for galaxies of different spectral types. We find that the slope of the SFRD-z relation for different spectral types of galaxies is a strong function of their stellar mass. For low- and intermediate-mass systems, the main contribution to the cosmic SFRD comes from the star-forming galaxies while, for more-massive systems, the evolved galaxies are the most dominant population.
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