The spectral index-flux density relation at 408 MHz and the cosmological evolution of extragalactic radio sources

Details The spectral index-flux density relation at 408 MHz and the cosmological evolution of extragalactic radio sources The spectral index-flux density relation at 408 MHz and the cosmological evolution of extragalactic radio sources

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165...39k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 39-44.

Astronomy and Astrophysics

Astronomy

20

Astronomical Models, Astronomical Spectroscopy, Cosmology, Extragalactic Radio Sources, Flux Density, Radio Astronomy, Radio Spectra

Scientific paper

The authors have investigated the dependence of the median spectral index (αmed) of extragalactic radio sources on flux density for sources selected from surveys at 408 MHz. Contrary to earlier claims they find no evidence for a flattening of source spectra at low flux levels. A comparison of the data with the predictions of several models of the epoch dependence of the radio luminosity function shows that most of the models do not reproduce the change in αmed from high to intermediate flux densities. The authors have traced the disagreement to the basic assumption in all evolutionary models that spectral indices are independent of frequency. This assumption is not valid for the subclass of compact steep-spectrum sources of high luminosity that are known to form a significant fraction of the strong sources in high-frequency catalogues but are poorly represented in low-frequency surveys.

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