Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..157w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 157-178.
Astronomy and Astrophysics
Astronomy
185
Active Galactic Nuclei, Active Galaxies, Astronomical Satellites, Galactic Radiation, Quasars, X Ray Spectra, Accretion Disks, Cosmic X Rays, Emission Spectra, Near Infrared Radiation, Seyfert Galaxies, X Ray Astronomy
Scientific paper
The paper presents results of X-ray emission from 13 objects observed by Ginga as part of a spectral survey of bright quasars in the energy range 2-20 keV. The distribution of the power-law energy index for this sample has a mean of 0.81 and shows significant intrinsic dispersion (0.31), values which are broadly compatible with those from samples of lower-luminosity AGN. Correlations between the X-ray spectral properties and those in other frequency bands are explored, and a possible connection between the near-infrared spectral indices and the X-ray properties of quasars is found. There is also evidence that quasars with steep X-ray spectra are radio-quiet, in support of the previous results obtained for the 0.3-3.5-keV band.
Hayashida Kiyoshi
Inoue Hajime
Kii Tsuneo
Koyama Katsuji
Makino Fumiyoshi
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