Constraining the complexities in Seyfert X-ray spectra - an analysis of simultaneous observations with GINGA and ROSAT

Details Constraining the complexities in Seyfert X-ray spectra - an analysis of simultaneous observations with GINGA and ROSAT Constraining the complexities in Seyfert X-ray spectra - an analysis of simultaneous observations with GINGA and ROSAT

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..193p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 267, p. 193

Astronomy and Astrophysics

Astronomy

68

Seyfert Galaxies, X Ray Spectra, Ginga Satellite, Rosat Mission, Active Galaxies, Spectrum Analysis, Variability, Markarian Galaxies, Galactic Radiation

Scientific paper

The X-ray spectra of five bright Seyfert galaxies are investigated on the basis of simultaneous observations with the Ginga and ROSAT satellites in order to elucidate the form of the absorption and reprocessing of X-ray photons in the nuclei of active galaxies. In every case, the underlying continuum has a power-law form, with a preferred photon index consistent with the revised canonical value of 1.9 +/- 0.1. For NGC 4051, the dominant feature is absorption from a substantial column density of ionized gas in the line of sight to the continuum source. Division of these data into low- and high-flux states confirms spectral variability for NGC 4051, with an indication of a flux-linked change in the ionization parameter and the emergence, in the high state, of a significant soft emission feature. Mrk 841 and 509 both exhibit features attributable to reflection from cold matter, plus a soft excess. For NGC 7213 and Fairall-9, both of which show FeK emission at an unusually high (rest) energy and a soft excess, a good overall spectral fit is obtained with an ionized disk model.

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