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

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251...15t&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 15-25.

Astronomy and Astrophysics

Astrophysics

75

Galactic Nuclei, Light Curve, Seyfert Galaxies, X Ray Sources, X Ray Spectra, Active Galactic Nuclei, Astronomical Catalogs, Autocorrelation, Cross Correlation, Data Reduction, Spectral Correlation, Variability

Scientific paper

In contrast with the Tennant et al (1981) sample of over 30 active galactic nuclei, HEAO 1 A-2 high time resolution X-ray observations of the X-ray emitting Seyfert 1 galaxy NGC 6814 show strong X-ray variability on time scales of less than 3 hr. On a time scale of 90 min, the mean flux varied by a factor of about 2.5, and a characteristic time for variability of 100 + 60 or - 25 sec is obtained by autocorrelation analysis. There is no indication of spectral variability with an upper limit on a change in the power law spectral index of less than about 0.37, for a factor 2 change in intensity. The constraints of such rapid variability on a range of X-ray source mechanisms is discussed.

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