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Title:
The 1.4-GHz cosmic star formation history at z < 1.3
Authors:
Upjohn, James E.; Brown, Michael J. I.; Hopkins, Andrew M.; Bonne, Nicolas J.
Affiliation:
AA(School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia; Monash Centre for Astrophysics, Monash University, Clayton, VIC 3800, Australia), AB(School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia; Monash Centre for Astrophysics, Monash University, Clayton, VIC 3800, Australia 0000-0002-1207-9137), AC(Australian Astronomical Optics, Macquarie University, 105 Delhi Rd, North Ryde, NSW 2113, Australia), AD(Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK)
Publication:
Publications of the Astronomical Society of Australia, Volume 36, id. e012 (PASA Homepage)
Publication Date:
03/2019
Origin:
CUP
Astronomy Keywords:
galaxies: evolution, galaxies: luminosity function, galaxies: star formation
Abstract Copyright:
2019: Astronomical Society of Australia
DOI:
10.1017/pasa.2019.6
Bibliographic Code:
2019PASA...36...12U

Abstract

We measure the cosmic star formation history out to z = 1.3 using a sample of 918 radio-selected star-forming galaxies within the 2-deg2 COSMOS field. To increase our sample size, we combine 1.4-GHz flux densities from the VLA-COSMOS catalogue with flux densities measured from the VLA-COSMOS radio continuum image at the positions of I < 26.5 galaxies, enabling us to detect 1.4-GHz sources as faint as 40 muJy. We find that radio measurements of the cosmic star formation history are highly dependent on sample completeness and models used to extrapolate the faint end of the radio luminosity function. For our preferred model of the luminosity function, we find the star formation rate density increases from 0.017 M&sun; yr-1 Mpc-3 at z ˜ 0.225 to 0.092 M&sun; yr-1 Mpc-3 at z ˜ 1.1, which agrees to within 40% of recent UV, IR and 3-GHz measurements of the cosmic star formation history.
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