Soft and hard X-ray variability from the accretion disk of NGC 5548

Details Soft and hard X-ray variability from the accretion disk of NGC 5548 Soft and hard X-ray variability from the accretion disk of NGC 5548

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226...59k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 59-68.

Astronomy and Astrophysics

Astronomy

46

Accretion Disks, Active Galactic Nuclei, Seyfert Galaxies, X Ray Spectra, Data Processing, Spectrum Analysis, X Ray Astronomy

Scientific paper

Exosat observations of the Seyfert galaxy NGC 5548 confirm previous detections of a soft X-ray excess above a power law component. Both components show correlated variability on a typical time scale of half a day. There is evidence for a delay of the hard X-rays with respect to the soft X-rays of 1-2 h. The spectral data can be explained in terms of an accretion disk surrounding a 10 to the 7th solar mass black hole. The accretion disk emits locally a modified blackbody spectrum, with a strong maximum in the emissivity at a distance of 5 Schwarzschild radii from the black hole. This radiation is visible as the soft X-ray excess. The hard X-rays are generated by Comptonization in a hot corona surrounding the innermost edge of the disk (from 3-4 Schwarzschild radii). No evidence for strong Fe line emission is found.

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