Rapid soft X-ray variability in NGC 3227.

Details Rapid soft X-ray variability in NGC 3227. Rapid soft X-ray variability in NGC 3227.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..509s&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 509 - 510

Astronomy and Astrophysics

Astrophysics

Seyfert Galaxies: X-Ray Variations, Seyfert Galaxies: X-Ray Light Curves, Seyfert Galaxies: X-Ray Spectra

Scientific paper

ROSAT PSPC lightcurves are presented for the Seyfert galaxy NGC 3227 at two different epochs separated by 2 yr. These lightcurves show statistically significant variability, the most rapid being a factor of ≡2 increase in only ≡20 min in 1991. Spectral analysis shows that a simple power-law with only Galactic absorption can usually characterize the observed spectrum in both the low and high states. One high-state observation during 1993 is clearly peculiar with respect to the others. If included in the extraction of the high-state spectrum, the simple power-law model no longer provides an entirely acceptable fit. Adding either an (oxygen) edge (e.g. a warm absorber) or a cold absorber that partially covers the source enables the data to be fitted equally well.

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