Redshifts of the brightest X-ray QSO's

Details Redshifts of the brightest X-ray QSO's Redshifts of the brightest X-ray QSO's

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.115..107s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 115, no. 1, Oct. 1985, p. 107-118.

Astronomy and Astrophysics

Astrophysics

1

Hubble Diagram, Quasars, Red Shift, X Ray Sources, Luminosity, Regression Analysis

Scientific paper

The plot of the X-ray luminosity (in 0.5 - 4.5 keV band and for Friedmann universe with q0 = +1) of the brightest X-ray QSO at each redshift against redshift shows that the X-ray luminosity increases more or less monotonically with redshift upto z ≡ 3. This result has been attributed to the selection effect known as the "volume effect". When this selection effect is taken into account in the optical, radio and X-ray windows of the electromagnetic spectrum, a sample of the brightest X-ray QSO's is obtained which shows a small dispersion in X-ray luminosity: >logLx1< = 46.15±0.25. The redshift-X-ray flux density plot for this sample gives slopes of both regression lines which agree, at a confidence level of 95% or greater, with the slopes expected theoretically if the redshifts of the QSO's are cosmological in nature.

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