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Evidence for an ionized reprocessor in NGC 6814
Turner, T. J.; Done, Christine; Mushotzky, Richard; Madejski, Greg; Kunieda, Hideyo
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(NASA, Goddard Space Flight Center, Greenbelt, MD), AD(NASA, Goddard Space Flight Center, Greenbelt, MD), AE(Nagoya University, Japan)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 102-110. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Accretion Disks, Ionized Gases, Seyfert Galaxies, X Ray Astronomy, Emission Spectra, K Lines, Line Spectra, Spaceborne Astronomy, X Ray Spectra
Bibliographic Code:


A detailed spectroscopic analysis of a Ginga observation of the Seyfert galaxy NGC 6814 is reported. It is shown that the X-ray data are consistent with a scenario in which the continuum radiation is reprocessed in a highly ionized medium, which can either be an accretion disk or a shell of absorbing material. Both of these can produce the strong observed iron K-alpha line, which must originate within 200 lt-sec of the continuum source. Significant iron K-beta and nickel K-alpha are predicted, based on the iron K-alpha line strength, and these lines partially conceal the iron edge in this source. The spectral variability below about 4 keV, where the apparent absorption increases as the continuum flux decreases, is probably caused by a warm absorber covering the reprocessing system.

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