Deep Radio Surveys

Details Deep Radio Surveys Deep Radio Surveys

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..189c&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

Astronomy and Astrophysics

Astronomy

5

Scientific paper

All radio surveys are deep in redshift and lookback time; sensitive radio surveys detect sources of lower luminosity. Every luminous radio galaxy and quasar out to z ˜ 10 has already been found by all-sky surveys and needs only to be identified. Star-forming galaxies dominate the population of sources fainter than S ≈ 0.1 mJy at 1.4 GHz, and sensitive surveys indicate strong evolution of the cosmic star-formation rate out to z ≈ 1. The large differences among source counts from existing deep surveys seem to be dominated by instrumental and analysis effects, not by cosmic variance. Using power-density functions instead of luminosity functions and weighting source counts by S^2 clarifies the contributions of different galaxy populations to the star-formation-rate density and to the radio sky background. Future surveys will require very high dynamic range and should not be limited by natural confusion above S ˜ 0.01 μJy.

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