Redshifts of the brightest X-ray QSO's |
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| Authors: | A K Sapre V D Mishra |
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| Institution: | (1) Department of Physics, Ravishankar University, Raipur, India |
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| Abstract: | The plot of the X-ray luminosity (in 0.5–4.5 KeV band and for Friedmann universe withq
0=+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 uptoz 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:  logL
 1 =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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