Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985chjss...5...84l&link_type=abstract
Chinese Journal of Space Sciences, vol. 5, April 1985, p. 84-91. In Chinese, with abstract in English.
Physics
Luminosity, Quasars, Statistical Analysis, X Ray Sources, Extragalactic Radio Sources, Histograms, Red Shift, X Ray Spectra
Scientific paper
Statistical analysis for 109 X-ray selected quasars as well as 114 radio and optically selected quasars is carried out in the paper. On the histograms of their redshift, optical luminosity, and average optical X-ray spectral index, it is found that X-ray selected quasars are distributed at the low ends of plots of these parameters. In the plot of the monochromatic X-ray luminosity against the monochromatic optical luminosity for all samples, most of the X-ray selected quasars are situated in optically faint regions of low luminosity. The radio and optically selected quasars have a slope of b = 0.64 in the optically bright region of this plot, and b = 0.95 in the optically faint region, while the value of b of the X-ray selected quasars is only 0.78, thus implying that they may be a subtype of quasar phenomenon. Finally, the factors affecting b are discussed briefly.
Liu Rong-Li
Yang Hyun Seok
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