The flux and spectral variability of NGC 6814 as observed with EXOSAT

Details The flux and spectral variability of NGC 6814 as observed with EXOSAT The flux and spectral variability of NGC 6814 as observed with EXOSAT

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238.1029m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 1029-1046.

Astronomy and Astrophysics

Astronomy

69

Active Galactic Nuclei, Exosat Satellite, Seyfert Galaxies, Autocorrelation, Black Holes (Astronomy), Light Curve, Power Spectra, X Ray Spectra

Scientific paper

Five Exosat observations of NGC 6814 were obtained between September 1983 and October 1985 at intervals of a few months to a year. Over these time scales, the soft X-ray flux was shown to vary by large factors and to decrease by over an order of magnitude in the first nine months. The medium energy flux also varied on these long time scales, but with a lower amplitude than that of the soft X-ray flux. The results show the temporal characteristics of NGC 6814 to be unusual with respect to other Seyferts. It is suggested that the present observations originate from regions close to the nuclear black hole where periodic flares may arise due to instabilities in a pair-dominated plasma.

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