Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.143..249d&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 143, no. 2, April 1988, p. 249-256.
Astronomy and Astrophysics
Astrophysics
Astronomical Models, Gravitational Constant, Luminosity, Radio Galaxies, Black Body Radiation, Infrared Spectra, Magnitude, Power Spectra, Red Shift
Scientific paper
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.
Das Pratap Kumar
Sivaram C.
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