Astrophysics and Space Science

, Volume 276, Issue 2–4, pp 791–798 | Cite as

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

  • Carlotta Gruppioni
  • Seb Oliver
  • Stephen Serjeant
Article

Abstract

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≤12Revised Shapley-Ames Catalogue, while for the non-local determination, we used a sample of87 star-forming galaxies taken from the Benn et al. (1993) sample. The inferred local star formation rate is about twice as great as the Hα estimate, while the intermediate 0.05<z<0.35 star formation rate is consistent with coeval ultraviolet and Hα 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.

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Carlotta Gruppioni
    • 1
  • Seb Oliver
    • 2
  • Stephen Serjeant
    • 2
  1. 1.Osservatorio Astronomico di BolognaBolognaItaly
  2. 2.Astrophysics Group, Blackett LaboratoryImperial College of Science, Technology and MedicineLondonUnited Kingdom

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