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Title:
The Dust-Unbiased Cosmic Star-Formation History from the 20 CM VLA-COSMOS Survey
Authors:
Smolčić, V.; Schinnerer, E.; Zamorani, G.; Bell, E. F.; Bondi, M.; Carilli, C. L.; Ciliegi, P.; Mobasher, B.; Paglione, T.; Scodeggio, M.; Scoville, N.
Affiliation:
AA(Max Planck Institut für Astronomie, Königstuhl 17, Heidelberg, D-69117, Germany ; California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Fellow of the International Max Planck Research School for Astronomy and Cosmic Physics.), AB(Max Planck Institut für Astronomie, Königstuhl 17, Heidelberg, D-69117, Germany ), AC(Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy ), AD(Max Planck Institut für Astronomie, Königstuhl 17, Heidelberg, D-69117, Germany ), AE(Istituto Nazionale di Astrofisica, Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy ), AF(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801-038, USA ), AG(Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy ), AH(Physics and Astronomy Department, University of California, Riverside, 900 University Ave, CA 92521, USA ), AI(York College, City University of New York, 94-20 Guy R. Brewer Boulevard, Jamaica, NY 11451, USA ; American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA ), AJ( Istituto di Astrofisica Spaziale e Fisica Cosmica Milano-Istituto Nazionale di Astrofisica, Via Bassini 15, I-20133, Milan, Italy ), AK(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA )
Publication:
The Astrophysical Journal, Volume 690, Issue 1, pp. 610-618 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
cosmology: observations, galaxies: evolution, galaxies: fundamental parameters, galaxies: starburst, radio continuum: galaxies
DOI:
10.1088/0004-637X/690/1/610
Bibliographic Code:
2009ApJ...690..610S

Abstract

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.

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.

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