X-ray spectral signatures of very thick cold matter in the spectra of Seyfert galaxies

Details X-ray spectral signatures of very thick cold matter in the spectra of Seyfert galaxies X-ray spectral signatures of very thick cold matter in the spectra of Seyfert galaxies

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ncimc..15..811p&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 15 C, no. 5, p. 811-818.

Computer Science

2

Accretion Disks, Ginga Satellite, Seyfert Galaxies, Spectral Signatures, X Ray Sources, X Ray Spectra, Active Galactic Nuclei, Compton Effect, Emission Spectra

Scientific paper

Over the last few years, GINGA observations of several bright Seyfert galaxies have revealed the existence of a new flat component in the X-ray spectrum of these objects above 8 keV. This component (the 'high-energy bump') is probably produced by the reprocessing of the intrinsic emission (through Compton scattering and photoelectric absorption) by a very thick and cold medium in the environment of the central source, such as an accretion disk. An alternative explanation is provided by partial covering and reprocessing by thick clouds, whose existence is supported by the latest results on the broad line region obtained by line reverberation measurements in the optical-ultraviolet band. The presence of iron fluorescent lines at 6.4 keV with an equivalent width of 100-200 eV in all those galaxies supports both scenarios. The implications of the presence of the high-energy bump on the spectral shape of the intrinsic continuum, the level of the soft X-ray excess and the X-ray background are briefly pointed out.

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