On the interpretation of the observed angular-size-flux-density relation for extragalactic radio sources

Details On the interpretation of the observed angular-size-flux-density relation for extragalactic radio sources On the interpretation of the observed angular-size-flux-density relation for extragalactic radio sources

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8...33k&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 8, March 1987, p. 33-50.

Astronomy and Astrophysics

Astrophysics

13

Cosmology, Extragalactic Radio Sources, Radiant Flux Density, Luminosity, Red Shift, Size Distribution

Scientific paper

The interpretation of the observed relation between median angular sizes (thetam) of extragalactic radio sources and flux density at 408 MHz has been examined. The predicted thetam-S relations based on well-observed strong sources in parent samples selected at 178 and 1400 MHz, and existing models of the evolving radio luminosity function, can be made to fit the observed relation only by invoking cosmological evolution in linear sizes even for the q(0) = 0 universe. Predictions based on a parent sample at 2.7 GHz are shown to overestimate the contribution of steep-spectrum, compact (SSC) sources in low-frequency samples unless the downward curvature in the spectra of such sources is taken into account. When approximate corrections are made for this effect, predictions based on the 2.7 GHz parent sample cannot obviate the need for linear size evolution as claimed in the literature.

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