Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5901m&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #59.01; Bulletin of the American Astronomical Society, Vol. 26, p.1412
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results of the analysis of 112 X-ray-selected and fully optically-identified quasars in four sky fields in the southern hemisphere, detected by the Rosat Position Sensitive Proportional Counters. These fields were originally studied for the ultraviolet-excess properties of objects in the fields. This is one of the largest sets of fully-identified Rosat-observed quasars. We determine the quasars' power-law spectral index alpha_E with three different methods: spectral ``stacking'', hardness ratios, and direct fitting, and discuss the differences between each of these methods. We derive monochromatic X-ray and optical luminosities L_x and Lopt and discuss the relationship between them, examine the optical-X-ray spectral slope alpha_ox and the related L_x/Lopt ratio and their relationship to redshift, L_x, and Lopt, and finally present a model which could explain the observations.
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