Universität zu Köln

van der Vlugt, D., Hodge, J. A., Algera, H. S. B., Smail, I, Leslie, S. K., Radcliffe, J. F., Riechers, D. A. and Rottgering, H. (2022). An Ultra-deep Multiband Very Large Array (VLA) Survey of the Faint Radio Sky (COSMOS-XS): New Constraints on the Cosmic Star Formation History. Astrophys. J., 941 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

We make use of ultra-deep 3 GHz Karl G. Jansky Very Large Array (VLA) observations of the COSMOS field from the multiband COSMOS-XS survey to infer radio luminosity functions(LFs)of star-forming galaxies (SFGs). Using similar to 1300 SFGs with redshifts out to z similar to 4.6, and fixing the faint and bright end shape of the radio LF to the local values, we find a strong redshift trend that can befitted by pure luminosity evolution with the luminosity parameter given by alpha(L )proportional to(3.40 +/- 0.11) - (0.48 +/- 0.06)z. We then combine the ultra-deep COSMOS-XS data set with the shallower VLA-COSMOS 3 GHz large project data set over the wider COSMOS field in order to fit for joint density + luminosity evolution, finding evidence for significant density evolution. By comparing the radio LFs to the observed far-infrared and ultraviolet (UV) LFs, we find evidence of a significant underestimation of the UV LF by 22%+/- 14% at high redshift(3.3 < z < 4.6, integrated down to 0.03 L-z=3*). We derive the cosmic star formation rate density(SFRD)by integrating the fitted radio LFs and find that the SFRD rises up to z similar to 1.8 and then declines more rapidly than previous radio-based estimates. A direct comparison between the radio SFRD and a recent UV-based SFRD, where we integrate both LFs down to a consistent limit(0.038 L-z=3*), reveals that the discrepancy between the radio and UV LFs translates to a significant (similar to 1 dex) discrepancy in the derived SFRD at z > 3, even assuming the latest dust corrections and without accounting for optically dark sources.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code van der Vlugt, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hodge, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Algera, H. S. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smail, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Leslie, S. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Radcliffe, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riechers, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rottgering, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-689292
DOI:	10.3847/1538-4357/ac99db
Journal or Publication Title:	Astrophys. J.
Volume:	941
Number:	1
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPECTRAL ENERGY-DISTRIBUTION; GALAXY LUMINOSITY FUNCTION; FORMATION RATE DENSITY; FORMING GALAXIES; ALMA SURVEY; FIELD-SOUTH; BRIGHT-END; SUBMILLIMETER GALAXIES; INFRARED PROPERTIES; FORMATION RATES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68929