ROSAT PSPC Observations of Seyfert 2 Galaxies

Details ROSAT PSPC Observations of Seyfert 2 Galaxies ROSAT PSPC Observations of Seyfert 2 Galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9804w&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #98.04; Bulletin of the American Astronomical Society, Vol. 24, p.1274

Astronomy and Astrophysics

Astronomy

Scientific paper

We present soft x-ray spectra of three Seyfert 2 galaxies obtained with the ROSAT PSPC. These spectra have the following properties: 1) For NGC 5506 and MCG-5-23-16 most of the flux occurs at energies greater than 1 keV and is associated with the hard x-ray continuum. Both sources suffer a significant photoelectric cut-off at ~ 1 keV, with column densities several times 10(22) cm(-2) . The third source, MKN 348, has very little flux in the ROSAT band, suggesting a photoelectric cut-off at higher energies, in agreement with GINGA observations. 2) In all three objects, x-rays are seen below the photoelectric cut-off at above the rate expected from a source with the hard powerlaw spectrum suffering a uniform column cut-off. This result indicates the presence of an additional x-ray component at soft energies (i.e. a \lq`soft excess\rq\rq ). The flux of this component is ~ 1 % that of the hard x-ray continuum. 3) In MCG-5-23-16 and MKN 348, this soft component is well-described by a powerlaw with a considerably steeper index than the hard x-ray continuum. No steep component is seen in NGC 5506, although additional absorption from the edge-on host galaxy would make such a detection difficult. We will discuss the implications these observations have for the molecular torus model and the scattering region in Seyfert 2 galaxies.

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