2017A&A...602A...5N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST09:02:05

2017A&A...602A...5N - Astronomy and Astrophysics, volume 602A, 5-5 (2017/6-1)

The VLA-COSMOS 3 GHz Large Project: Cosmic star formation history since z ∼ 5.

NOVAK M., SMOLCIC V., DELHAIZE J., DELVECCHIO I., ZAMORANI G., BARAN N., BONDI M., CAPAK P., CARILLI C.L., CILIEGI P., CIVANO F., ILBERT O., KARIM A., LAIGLE C., LE FEVRE O., MARCHESI S., McCRACKEN H., MIETTINEN O., SALVATO M., SARGENT M., SCHINNERER E. and TASCA L.

Abstract (from CDS):

We make use of the deep Karl G. Jansky Very Large Array (VLA) COSMOS radio observations at 3GHz to infer radio luminosity functions of star-forming galaxies up to redshifts of z∼5 based on approximately 6000 detections with reliable optical counterparts. This is currently the largest radio-selected sample available out to z∼5 across an area of 2 square degrees with a sensitivity of rms ~=2.3 µJy/beam. By fixing the faint and bright end shape of the radio luminosity function to the local values, we find a strong redshift trend that can be fitted with a pure luminosity evolution L1.4GHz∝(1 + z)(3.16±0.2)–(0.32±0.07)z. We estimate star formation rates (SFRs) from our radio luminosities using an infrared (IR)-radio correlation that is redshift dependent. By integrating the parametric fits of the evolved luminosity function we calculate the cosmic SFR density (SFRD) history since z∼5. Our data suggest that the SFRD history peaks between 2<z<3 and that the ultraluminous infrared galaxies (100M/yr<SFR<1000M/yr) contribute up to ∼25% to the total SFRD in the same redshift range. Hyperluminous infrared galaxies (SFR>1000M/yr) contribute an additional ≤2% in the entire observed redshift range. We find evidence of a potential underestimation of SFRD based on ultraviolet (UV) rest-frame observations of Lyman break galaxies at high redshifts (z≥4) on the order of 15-20%, owing to appreciable star formation in highly dust-obscured galaxies, which might remain undetected in such UV observations.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: evolution - galaxies: star formation - cosmology: observations - radio continuum: galaxies - radio continuum: galaxies

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 613 0
2 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1279 0
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2064 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-09:02:05

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