Hard X-ray observations of AGN - Do accretion discs exist?

Details Hard X-ray observations of AGN - Do accretion discs exist? Hard X-ray observations of AGN - Do accretion discs exist?

Publishing date

May 1992

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..173m&link_type=abstract

Journals

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 3

Accretion Disks, Active Galactic Nuclei, Quasars, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Ginga Satellite, Statistical Analysis, Thermal Emission

Type

Scientific paper

Abstract

Results of detailed analysis of statistical data based on Ginga observations (energy range: 1.5-3.0 keV) of AGN are presented. The overall X-ray spectra of Seyfert 1 galaxies are generally found to rule out a model consisting of a simple power law with uniform absorption plus an iron emission line. Spectra of some Seyfert 1 galaxies (IC 4329A, NGC 7469, MCG-6-30-15, etc.) are well fitted to the recently favored reflection model, but those of some other Seyfert galaxies (NGC 4151, NGC 6814, NGC 5506, etc.) rule out this simple reflection model. Spectra of NGC 4151 and NGC 6814 are well fitted to a partial covering model, but those of NGC 5506 rule out both the simple reflection model and the simple partial covering model. It is argued that AGN have a somewhat bloblike matter as well as an accretion disk around their central region.

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