Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet..380t&link_type=abstract
"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R
Physics
Scientific paper
I review the principal radiation mechanisms which can be responsible for the production of high energy emission of Galactic and extragalactic sources. The spectral properties of Comptonization processes are studied. I present a rigorous treatment of the problem in terms of the Boltzmann kinetic equation formalism. I also overview the different exact and approximate analytical and numerical techniques which decouple the photon transport in six dimensions to that in the configuration space and in energy space separately. CGRO, RXTE, SAX, XMM and CHANDRA observations of Galactic black hole, neutron star systems, and Seyfert nuclei show that their spectra can be fitted by thermal Comptonization models in the hard state, and two components in the soft state. In the latter case, these components show a blackbody like spectrum with the color temperature which is a fraction of keV and tens of eV for Galactic and extragalactic sources, respectively, and an extended power-law with spectral index between 1 and 2 (in the neutron star systems in their soft state this power-law component is not detected). I give arguments for an explanation of these two types of spectral states in the framework of the thermal and bulk motion Comptonization processes. Furthermore I demonstrate that the change of X-ray spectra during the soft-hard transition is related to the temperature of the bulk inflow. In other words the effect of the bulk Comptonization compared to thermal one is getting stronger when the plasma temperature drops below 10 keV. It is clear that the spectra emerging from the converging inflow are inevitable stamp of black hole sources where the strong gravitational field dominates the pressure forces.
No associations
LandOfFree
Comptonization Processes in Galactic and Extragalactic High Energy Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Comptonization Processes in Galactic and Extragalactic High Energy Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comptonization Processes in Galactic and Extragalactic High Energy Sources will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1167106