Computer Science
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1323n&link_type=abstract
The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1323-1327 (1997).
Computer Science
Active And Peculiar Galaxies And Related Systems, Infall, Accretion, And Accretion Disks, Magnitudes And Colors, Luminosities, Electric And Magnetic Fields
Scientific paper
We here consider the pressure equilibrium during an intense magnetic flare above the surface of a cold accretion disk. Under the assumption that the heating source for the plasma trapped within the flaring region is an influx of energy transported inwards with a group velocity close to c, e.g., by magnetohydrodynamic waves, this pressure equilibrium can constrain the Thomson optical depth τT to be of order unity. We suggest that this may be the reason why τT~1 in Seyfert Galaxies. We also consider whether current data can distinguish between the spectrum produced by a single X-ray emitting region with τT~1 and that formed by many different flares spanning a range of τT. We find that the current observations do not yet have the required energy resolution to permit such a differentiation. Thus, it is possible that the entire X-ray/γ-ray spectrum of Seyfert Galaxies is produced by many independent magnetic flares with an optical depth 0.5<τT<2.
Melia Fulvio
Nayakshin Sergei
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