Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..36l&link_type=abstract
"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #3
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recently a close correlation between the photon index of the power law component and either the frequency of Quasi Periodic Oscillations (QPOs) or the flow of accretion disk has been found in the X-ray data concerning Black Holes (BH) in binary systems. The shape of this relationship, characterized by a saturation index when the system achieves high spectral brightness, finds a natural explanation in the processes of thermal and bulk Comptonization which are unique characteristic of the presence of a BH. For the whole set of observation we adopted a model consisting of the spectral component of BMC (Bulk Motion Comptonization model) that takes into account the direct emission of black body and the Comptonization process.
Farinelli Ruben
Frontera Filippo
Lombardi Carlos
Titarchuk Lev
Virgilli E.
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