期刊
ASTROPHYSICAL JOURNAL
卷 690, 期 1, 页码 610-618出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/690/1/610
关键词
cosmology: observations; galaxies: evolution; galaxies: fundamental parameters; galaxies: starburst; radio continuum: galaxies
资金
- Max-Planck Society
- Alexander von Humboldt Foundation
- PSC-CUNY [69612-00 38]
- [PRIN-INAF 2005]
- [PRIN-INAF 2007]
We derive the cosmic star-formation history out to z = 1.3 using a sample of similar to 350 radio-selected star-forming (SF) galaxies, a far larger sample than those in previous, similar studies. We attempt to differentiate between radio emission from active galactic nuclei and SF galaxies, and determine an evolving 1.4 GHz luminosity function (LF) based on these VLA-COSMOS SF galaxies. We precisely measure the high-luminosity end of the SF galaxy LF (star-formation rate greater than or similar to 100 M(circle dot) yr(-1); equivalent to ultra-luminous IR galaxies) out to z = 1.3, finding a somewhat slower evolution than that previously derived from mid-infrared data. We find that more stars are forming in luminous starbursts at high redshift. We use extrapolations based on the local radio galaxy LF; assuming pure luminosity evolution, we derive L(*) alpha (1 + z)(2.1 +/- 0.2) or L(*) alpha (1 + z)(2.5 +/- 0.1), depending on the choice of the local radio galaxy LF. Thus, our radio-derived results independently confirm the similar to 1 order of magnitude decline in the CSFH since z similar to 1.
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