Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360l..35p&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. L35-L38.
Astronomy and Astrophysics
Astrophysics
103
Extraterrestrial Matter, Seyfert Galaxies, Spectral Signatures, X Ray Spectra, Accretion Disks, Background Radiation, Emission Spectra, Iron, X Ray Fluorescence, X Ray Sources
Scientific paper
Observations with Ginga of the bright Seyfert 1 galaxies NGC 7469 and IC 4329A have revealed the presence of a hard X-ray bump above 8 keV. This new spectral component is probably produced by absorption or reflection of the central emission by a very thick cold medium in the environment of the central source, possibly in an accretion disk. Detection of iron fluorescence lines at 6.4 keV, with equivalent widths of 100-150 eV in both objects, supports this scenario. The implications of these results for the spectral shape of the intrinsic X-ray continuum, the intensity of the soft X-ray excess in Seyfert galaxies, and the cosmic X-ray background, are pointed out.
Matsuoka Masaru
Piro Luigi
Yamauchi Makoto
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