Article

X-ray studies of quasars with the Einstein Observatory. II

05/1981;
Source: NTRS

ABSTRACT X-ray observations of 107 quasars have been carried out with the Einstein Observatory, and 79 have been detected. A correlation between optical emission and X-ray emission is found; and for radio-loud quasars, the data show a correlation between radio emission and X-ray emission. For a given optical luminosity, the average X-ray emission of radio-loud quasars is about three times higher than that of radio-quiet quasars. The data also suggest that the ratio of X-ray to optical luminosity is decreasing with increasing redshift and/or optical luminosity. The data support the picture in which luminosity evolution, rather than pure density evolution, describes the quasar behavior as a function of redshift.

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Keywords

average X-ray emission
 
data support
 
Einstein Observatory
 
given optical luminosity
 
luminosity evolution
 
optical emission
 
optical luminosity
 
pure density evolution
 
quasar behavior
 
radio emission
 
radio-loud quasars
 
radio-quiet quasars
 
X-ray
 
X-ray emission
 
X-ray observations