Rapid X-ray variability in the Seyfert galaxy NGC 6814

Details Rapid X-ray variability in the Seyfert galaxy NGC 6814 Rapid X-ray variability in the Seyfert galaxy NGC 6814

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phdt.........1t&link_type=abstract

Ph.D. Thesis - Maryland Univ. National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.

Computer Science

Galactic Nuclei, Galactic Radiation, Seyfert Galaxies, X Ray Sources, Active Galactic Nuclei, Autocorrelation, Compton Effect, Flux (Rate), Heao 1, Periodic Variations

Scientific paper

The HEAO-1 A-2 high time resolution X-ray observations of the X-ray emitting Seyfert I Galaxy NGC 6814 are reported. In sharp distinction with a sample of over 30 active galactic nuclei this object showed strong X-ray variability on timescales less than 3 hours. The mean flux on a timescale of 90 minutes varied by a factor of approximately 2.5 corresponding to Delta Lx being approximately 1 x 10 to the 43rd power ergs/sec. An autocorrelation analysis shows a characteristic time for variability of 100 (+60 or -25) seconds. There is no indication of spectral variability with an upper limit on a change in the power law spectral index of the absolute value of Delta gamma .37, for a factor two change in intensity. The constraints of such rapid variability on a wide variety of X-ray source mechanisms are considered.

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