X-ray spectral variability and complex absorption in the Seyfert 1 galaxies NGC 4051 and MCG -6-30-15

Details X-ray spectral variability and complex absorption in the Seyfert 1 galaxies NGC 4051 and MCG -6-30-15 X-ray spectral variability and complex absorption in the Seyfert 1 galaxies NGC 4051 and MCG -6-30-15

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..440m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 440-458.

Astronomy and Astrophysics

Astrophysics

198

Galactic Radiation, Light Curve, Power Spectra, Seyfert Galaxies, X Ray Spectra, Abundance, Compton Effect, Iron

Scientific paper

Results are presented on Ginga observations of the Seyfert 1 galaxies NGC 4051 and MCG -6-30-15, which reveal the presence of large-amplitude (greater than 50 percent) spectral variations in both objects, thus confirming and extending previous Exosat results. These variations are associated with spectral changes; it was found that the spectra are steeper for the brighter sources. The observed positive correlation between the spectral index and the luminosity provides strong constraints to radiative models and rules out models where the spectrum becomes harder when the X-ray luminosity increases.

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