Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..945g&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Backgground p 945-950 (SEE N90-25
Astronomy and Astrophysics
Astronomy
3
Accretion Disks, Active Galactic Nuclei, Iron, K Lines, Monte Carlo Method, Astronomical Models, Background Radiation, Galactic Structure, Nonthermal Radiation, Relativistic Effects, X Ray Sources
Scientific paper
The substantial amounts of optically thick, cold gas able to survive close to the continuum-emitting regions of Active Galactic Nuclei (AGN) can reprocess the nonthermal spectrum. In the X-ray band, iron K-shell features can provide a strong diagnostic of the geometry and kinematics of the innermost regions of the putative accretion flow. A specific geometry of the cold material, namely that of a Keplerian accretion disc surrounding a supermassive object is considered. Results are presented from Monte Carlo simulations of both the fluorescence and continuum emission from a cold, flat, optically thick disc when illuminated by an external nonthermal radiative flux. Model spectra are fitted to Ginga data from NGC 3227. It is found that the form of the X-ray spectrum of this object is consistent with such a scenario.
Fabian Andrea C.
George Ian Michael
Nandra Kirpal
Pounds Kenneth A.
Stewart Gordon C.
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