An X-ray survey of quasars using ASCA

Details An X-ray survey of quasars using ASCA An X-ray survey of quasars using ASCA

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..468r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 468

Astronomy and Astrophysics

Astrophysics

79

X Ray Sources, Quasars, Satellite Observation, Red Shift, Absorption Spectra, Spectral Resolution, Spectral Sensitivity, Ginga Satellite, Exosat Satellite, Power Spectra, Fluorescence, Line Spectra

Scientific paper

The ASCA (Advanced Satellite for Cosmology and Astrophysics) X-ray observations of 24 quasars, with redshifts greater than 0.05, are presented. The greater sensitivity and spectral resolution of ASCA extend the EXOSAT and Ginga surveys to higher redshifts. Significant intrinsic absorption is observed in some of the high-redshift objects, and a strong correlation is seen between absorption and quasar redshift, significant at greater than 99 percent confidence level. The radio-loud objects in this survey are found, in general, to have flatter X-ray power-law spectra with weak or no iron fluorescence lines. In contrast, the radio-quiet quasars seem to have steeper spectra, with stronger iron lines. The mean photon index of the radio-quiet quasars is found to be 1.93 +/- 0.06, whereas the radio-loud quasars have a mean index of 1.63 +/- 0.04. This corresponds to a significant difference in spectral shape between the radio-loud and radio-quiet quasars, at about the 99 percent significance level, which was not found in the earlier Ginga sample.

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