X ray spectral variability in Seyfert 1 galaxies

Details X ray spectral variability in Seyfert 1 galaxies X ray spectral variability in Seyfert 1 galaxies

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..985m&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 985-989 (SEE N90-258

Astronomy and Astrophysics

Astronomy

1

Seyfert Galaxies, Spectral Correlation, Spectrum Analysis, Variability, X Ray Spectra, Active Galactic Nuclei, Astronomical Models, Luminosity, X Ray Sources

Scientific paper

Ginga observations revealed spectral variations in Seyfert galaxies, NGC4051, NGC5548, NGC7469, MCG-6-30-15, and IC4329A. These variations are described by spectral index changes, correlated with luminosity. A variation delta gamma equal to 0.3 to 0.4 around gamma equal to 1.7 is associated with a change by a factor of 3 to 4 of the intensity. An empirical formula of delta gamma is derived in the 2 to 30 keV band from the analysis of two rapid variable Seyfert galaxies, NGC4051 and MCG-6-30-15. The observed positive correlation between the spectral index and luminosity might originate from the central source near a black hole, providing a strong constraint on radiative models.

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