Investigation of the optical fields of flat-spectrum radio sources to faint limiting magnitudes

Details Investigation of the optical fields of flat-spectrum radio sources to faint limiting magnitudes Investigation of the optical fields of flat-spectrum radio sources to faint limiting magnitudes

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..601p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Feb. 1981, p. 601-612. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

56

Astronomical Photography, Optical Emission Spectroscopy, Radio Sources (Astronomy), Galaxies, Quasars, Red Shift, Sky Surveys (Astronomy), Stellar Magnitude

Scientific paper

A deep optical survey of the fields of 16 flat-spectrum radio sources has been carried out using the Hale 5-m telescope, with a prototype charge-coupled device as a detector. These sources are members of a complete sample, selected as having S(2.7 GHz) greater than 1.5 Jy, and were either unidentified, or were identified with very faint objects on the prints of the Palomar Sky Survey. Identifications are found for 12 of these objects; six are galaxies and six are stellar objects. Identifications for the 2.7-GHz sample are now 96% complete, allowing much improved redshift distributions to be derived. Values of V/V(max) for the sample members have also been calculated, with the result that mean V/V(max) for the flat-spectrum quasars is 0.68, rather than the values nearer 0.5 derived from studies of deeper samples. This result indicates that the steep-spectrum and flat-spectrum quasars undergo similar degrees of cosmological evolution.

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