Snapshot of the X-ray spectrum in the flare model of AGN: theoretical issues

Details Snapshot of the X-ray spectrum in the flare model of AGN: theoretical issues Snapshot of the X-ray spectrum in the flare model of AGN: theoretical issues

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..261c&link_type=abstract

SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,

Astronomy and Astrophysics

Astrophysics

Scientific paper

We consider the time dependent illumination of an accretion disc in Active Galactic Nuclei according to the flare model, which postulates the sudden release of a large X-ray flux above a small region of the accretion disc. Taking into account the fact that this region is not illuminated before the flare, the increase of the reflected spectrum takes place on a cold reflector. The reflected spectrum begins to display the characteristics of a hot skin only a few hours after the onset of the flare. Due to the overlapping of different flares in non-equilibrium state and to thermal instabilities evolving slowly through thermal conductivity, the observed soft X-ray spectrum and the Fe K-alpha line should be completely decorrelated from the hard X-ray continuum. We show examples of such spectra.

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