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V. Smolčić et al. 2009 ApJ 690 610 doi:10.1088/0004-637X/690/1/610

THE DUST-UNBIASED COSMIC STAR-FORMATION HISTORY FROM THE 20 CM VLA-COSMOS SURVEY*

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V. Smolčić1,2,10, E. Schinnerer1, G. Zamorani3, E. F. Bell1, M. Bondi4, C. L. Carilli5, P. Ciliegi3, B. Mobasher6, T. Paglione7,8, M. Scodeggio9 and N. Scoville2

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Abstract References Cited By

We derive the cosmic star-formation history out to z = 1.3 using a sample of ~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 gsim100 M sun 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 * vprop (1 + z)2.1±0.2 or L * vprop (1 + z)2.5±0.1, depending on the choice of the local radio galaxy LF. Thus, our radio-derived results independently confirm the ~1 order of magnitude decline in the CSFH since z ~ 1.


Footnote
*  Based on observations with the National Radio Astronomy Observatory which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Keywords

cosmology: observations; galaxies: evolution; galaxies: fundamental parameters; galaxies: starburst; radio continuum: galaxies


Dates

Issue 1 (2009 January 1)

Received 2008 April 24, accepted for publication 2008 August 25

Published 2008 December 1



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