Evolution of the Luminosity of Galaxies and Quasars in the Standard Cosmology

Details Evolution of the Luminosity of Galaxies and Quasars in the Standard Cosmology Evolution of the Luminosity of Galaxies and Quasars in the Standard Cosmology

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sva....36..471t&link_type=abstract

Soviet Astronomy, Vol.36, NO. 5/SEP, P.471, 1992

Astronomy and Astrophysics

Astronomy

1

Scientific paper

It is shown that the Hubble m(z) curve for galaxies and quasars, averaged over a large data set, forms a single continuous curve, to first order, in the redshift range 10^-2.5^ <= z <= 4.5, which is described satisfactorily by the function m(z) = 5 log z-8 log(z+1)+21.5 The large departure of the observed mean function from the theoretical one predicted by the standard cosmology is explained by the strong evolution of the luminosity of galaxies and especially of quasars. The corresponding statistical-mean function for variation of absolute luminosity over the last 4/5 of the time of existence of the universe is M(z) = -8 log(z+1)-21.5 The luminosity of the remotest of the observed quasars is an average of six or seven magnitudes higher than that of nearby galaxies and quasars. It is found that even the remotest quasars at z~5 are still at maximum luminosity; quasar creation must therefore be expected at z > 5-6. The relative rate of decrease in the luminosity of galaxies and nearby quasars is presently fairly close to 7% of a magnitude per 10^9^ years. The mean Hubble curve obtained for galaxies and quasars is probably the main sequence for their evolution in the universe. The shape of the spectrum of galaxies and quasars is shown to be independent of redshift, i.e., to remain constant over (10-12) x 10^9^ years. The evolution of luminosity can then be explained by a simultaneous decrease with time in the spectral density of the light flux at all frequencies.

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