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Title: Luminosity enhancement of distant radio galaxies and varying G Hoyle-Narlikar cosmology
Authors: Das, P. K
Sivaram, C
Keywords: Astronomical Models;Gravitational Constant;Luminosity;Radio Galaxies;Black Body Radiation;Infrared Spectra;Magnitude;Power Spectra;Red Shift
Issue Date: Apr-1988
Publisher: Kluwer Academic Publishers
Citation: Astrophysics and Space Science, Vol. 143, No. 2, pp. 249 - 256
Abstract: The time evolution of galactic luminosity in the framework of the Hoyle-Narlikar (1964, 1974) (HN) cosmology with a variable gravitational constant G is investigated. The luminosity evolution with redshift is studied for both black-body and power-law sources. The G varying HN cosmological models are seen to predict systematically higher luminosities for galaxies at earlier epochs. For thermal black-body sources the increase in infrared K-band luminosity is estimated to be about 1.5 mag for a redshift of z of about 1. Also, the higher temperatures at earlier epochs implied by these models would make the distant galaxies appear bluer. For sources with power-law spectra the magnitude changes are even larger. There is some measure of observational support for the above theoretical predictions.
ISSN: 0004-640X
Appears in Collections:IIAP Publications

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