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The Nature of the Faint Radio Source Population and Star Formation History derived from Sub-MJY Surveys

Gruppioni, Carlotta; Oliver, Seb and Serjeant, Stephen (2001). The Nature of the Faint Radio Source Population and Star Formation History derived from Sub-MJY Surveys. Astrophysics and Space Science, 276(2/4) pp. 791–798.

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We present new results on the nature of the faint radio galaxy population obtained from a deep identification study in the Marano Field. This work represents the highest identification fractions attained to date in literature for sub-mJy radio samples. Star-forming galaxies constitute a significant fraction of the optical counterparts of sub-mJy radio sources, although they are not the dominant identification class (as formerly believed). We also present a new determination of the co-moving star formation density from z=0 to z~=0.35 using the radio luminosity function of star-forming galaxies. For the local determination, we used a sample of 231 spiral galaxies taken from the B<=12 Revised Shapley-Ames Catalogue, while for the non-local determination, we used a sample of 87 star-forming galaxies taken from the Benn et al. (1993) sample. The inferred local star formation rate is about twice as great as the H_alpha estimate, while the intermediate 0.05<z <0.35 star formation rate is consistent with coeval ultraviolet and H_alpha estimates. This is due to large-scale structure, rarely accounted for in estimates of the cosmic star formation history; the situation could improve significantly with deep moderate-area radio surveys.

Item Type: Journal Article
ISSN: 1572-946X
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 5824
Depositing User: Users 13 not found.
Date Deposited: 07 Nov 2006
Last Modified: 14 Jan 2016 16:17
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