Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985japa....6...49s&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 6, March 1985, p. 49-56.
Astronomy and Astrophysics
Astronomy
1
Cosmology, Hubble Diagram, Quasars, X Ray Astronomy, Red Shift, Regression Analysis
Scientific paper
The Hubble diagram for QSOs, is constructed using published data on X-ray fluxes of 159 QSOs observed from the Einstein Observatory. The scatter in the Hubble diagram and the lack of an obvious redshift/flux-density correlation for these QSOs have been attributed to the observational selection effect, that the intrinsically less luminous QSOs can be detected only in the nearby region of space. When the optical, radio, and X-ray selection effects are removed, keeping only the intrinsically brighter sources, a sample of 16 QSOs is obtained having a small dispersion in X-ray luminosities, a statistically significant linear correlation between (log fx, log cz) pairs, and a slope A = -1.906 + or - 0.061 for the linear regression of log fx on log cz. This slope is consistent, at a confidence level of 95 percent or greater, with the slope of -2.0 expected theoretically based on the assumption that the redshifts of QSOs are cosmological in nature.
Mishra V. D.
Sapre A. K.
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