Redshift dependence of the low-frequency turnover of quasars

Menon, T. K. (1983) Redshift dependence of the low-frequency turnover of quasars The Astronomical Journal, 88 (5). pp. 598-601. ISSN 0004-6256

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I have 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. I show 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.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Extragalactic Radio Sources; Quasars; Red Shift; Low Frequencies; Radio Spectra
ID Code:75486
Deposited On:27 Dec 2011 13:40
Last Modified:18 May 2016 19:29

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