Redshift dependence of the low-frequency turnover of quasars

Details Redshift dependence of the low-frequency turnover of quasars Redshift dependence of the low-frequency turnover of quasars

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..598m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 88, May 1983, p. 598-601. Research supported by the National Sciences and Engineerin

Mathematics

Logic

10

Extragalactic Radio Sources, Quasars, Red Shift, Low Frequencies, Radio Spectra

Scientific paper

The author has identified a sample of quasars whose spectra exhibit clearly defined maxima at low frequencies. The turnover frequencies are found to increase with redshift, but the equipartition angular sizes, deduced on the assumption of a synchrotron self-absorption model, decrease much faster than is predicted by any simple cosmological model. It is shown that this variation may be due to the steep density gradient of the gas in the nuclear regions of the parent galaxies and to the increase in number density or luminosity of the sources at earlier epochs.

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