Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..753p&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 753-762 (SEE N90-258
Astronomy and Astrophysics
Astronomy
10
Active Galactic Nuclei, Emission Spectra, Galactic Radiation, K Lines, X Ray Spectra, Accretion Disks, Astronomical Models, Iron, Seyfert Galaxies
Scientific paper
Evidence accumulated over the past 3 to 4 years for a soft excess in the X-ray spectra of many active galactic nuclei (AGN) are discussed. They are interpreted as thermal emission from the innermost stable region of an accretion disc feeding the putative black hole at the center of the active nucleus. X-ray data from the EXOSAT and Ginga satellites revealed a second indicator of optically thick matter in the vicinity of the active nucleus, in the form of an iron K-fluorescence line at approximately 6.4 keV. The discovery of two features, of continuum absorption and reflection, are reported. They were revealed in a composite spectrum from multiple Ginga observations of Seyfert-type AGN. The spectral features are modeled by reprocessing of the hard X-ray power law continuum in a slab (disc) of cold matter. Evidence for a substantial line-of-sight column of photoionized material is found in some AGN. The implications of these X-ray spectral data for a unified model of AGN are discussed.
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