A complete sample of extragalactic radio sources at 1 Jy at 408 MHz. III - Estimated redshifts and radio luminosities

Astronomy and Astrophysics – Astronomy

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Extragalactic Radio Sources, Luminosity, Red Shift, Quasars, Radio Galaxies, Radio Spectra

Scientific paper

Two previous papers presented measurements of the properties of a complete radio-selected sample of 59 B2 radio sources with flux densities between 1 and 2 Jy at 0.4 GHz. Here, the radio and optical identification data are discussed and interpreted. In order to estimate redshifts from the optical data in Paper II, the magnitude-redshift relations for radio galaxies and quasars in the bright-source sample of Laing, Riley & Longair were examined. The estimated redshifts are used in conjunction with existing data (mainly from bright-source samples) to examine the space-density evolution of the extragalactic radio-source population. Quasars appear to occupy the same range of radio luminosity at all redshifts, indicating that the shape of the quasar radio luminosity function may be independent of redshift.

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