Radio-loud and radio-quiet quasars observed by EXOSAT

Details Radio-loud and radio-quiet quasars observed by EXOSAT Radio-loud and radio-quiet quasars observed by EXOSAT

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..743l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 4, p. 743-750.

Astronomy and Astrophysics

Astronomy

61

Active Galactic Nuclei, Astronomical Spectroscopy, Exosat Satellite, Quasars, Radio Astronomy, Continuous Radiation, X Ray Astronomy

Scientific paper

We present results from the spectral analysis of EXOSAT data on 31 quasars, 18 radio-loud and 13 radio-quiet. Simple power-law models with fixed (Galactic) absorption give acceptable fits to the spectra obtained in the 2-10 keV band. Using the results from these fits we have compared the distributions of spectral indices alpha for the radio-loud and radio-quiet quasars in the sample. We find that the X-ray spectrum is flatter for radio-loud quasars, alpha-bar = 0.66 +/- 0.07, and is consistent with a single power-law index for these objects. The radio-quiet group, however, shows a steeper average spectrum, alpha-bar = 0.90 +/- 0.11, and a wider spread of indices.

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