GINGA observations of the X ray spectra of AGN

Details GINGA observations of the X ray spectra of AGN GINGA observations of the X ray spectra of AGN

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..783i&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 783-787 (SEE N90-258

Astronomy and Astrophysics

Astronomy

18

Active Galactic Nuclei, Ginga Satellite, Japanese Space Program, Satellite Observation, X Ray Spectra, Accretion Disks, Black Holes (Astronomy), Emission Spectra, Fluorescence, Galactic Radiation, Iron, K Lines, Seyfert Galaxies

Scientific paper

Ginga obtained X-ray spectra in the 1.5 to 37 keV range from several tens of Active Galactic Nuclei (AGNs). The mean spectral slope of those AGNs is steeper than that of the cosmic X-ray background. Seyfert galaxies and possibly radio-quiet quasars generally exhibit iron emission lines with equivalent widths of 100 to 200 eV. Such a large equivalent width of the fluorescent line, together with a shallow and broad absorption feature above the iron K-edge energy, can be interpreted by considering an optically thick accretion disk as a reprocessor of X-rays from a central source.

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