dc.contributor.author |
Das, P. K |
|
dc.contributor.author |
Sivaram, C |
|
dc.date.accessioned |
2009-01-23T14:10:13Z |
|
dc.date.available |
2009-01-23T14:10:13Z |
|
dc.date.issued |
1988-04 |
|
dc.identifier.citation |
Astrophysics and Space Science, Vol. 143, No. 2, pp. 249 - 256 |
en |
dc.identifier.issn |
0004-640X |
|
dc.identifier.uri |
http://hdl.handle.net/2248/4279 |
|
dc.description.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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Kluwer Academic Publishers |
en |
dc.relation.uri |
http://adsabs.harvard.edu/abs/1988Ap%26SS.143..249D |
en |
dc.relation.uri |
http://dx.doi.org/10.1007/BF00637139 |
en |
dc.subject |
Astronomical Models |
en |
dc.subject |
Gravitational Constant |
en |
dc.subject |
Luminosity |
en |
dc.subject |
Radio Galaxies |
en |
dc.subject |
Black Body Radiation |
en |
dc.subject |
Infrared Spectra |
en |
dc.subject |
Magnitude |
en |
dc.subject |
Power Spectra |
en |
dc.subject |
Red Shift |
en |
dc.title |
Luminosity enhancement of distant radio galaxies and varying G Hoyle-Narlikar cosmology |
en |
dc.type |
Article |
en |