Please use this identifier to cite or link to this item:
http://hdl.handle.net/2248/4279
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. |
URI: | http://hdl.handle.net/2248/4279 |
ISSN: | 0004-640X |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Luminosity enhancement of distant radio galaxies | 534.7 kB | Adobe PDF | View/Open |
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