Soft X-ray variability of NGC 5548: spectral analysis.

Details Soft X-ray variability of NGC 5548: spectral analysis. Soft X-ray variability of NGC 5548: spectral analysis.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acaps..17..371z&link_type=abstract

Acta Astrophys. Sin., Vol. 17, No. 4, p. 371 - 379

Astronomy and Astrophysics

Astrophysics

Seyfert Galaxies: Soft X Rays, Seyfert Galaxies: Variability

Scientific paper

The author reports the analysis results of ROSAT PSPC pointing observations of NGC 5548. The count rate of NGC 5548 shows a large amplitude variability with a factor of 14 during ROSAT observations. The hardness ratio has a negative correlation with the count rate, which arises from a "soft excess" emission in addition to a power-law component. The author treated the "soft excess" as blackbody or thermal bremsstrahlung model. The thermal temperature of the "soft excess" is nearly constant at 0.08 keV for a blackbody model and at 0.23 keV for a thermal bremsstrahlung model.

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