Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.1072o&link_type=abstract
"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an
Physics
Accretion, Accretion Disks, Black Hole Physics, Shock Waves
Scientific paper
Rotating adibatic accretion flows with adequate injection parameters around black holes could form standing shock waves close to the black holes, after the flow passes through the outer sonic point and can be virtually stopped by the centrifugal force. Taking account of the cooling and heating of the gas and the radiation transport, we numerically examine such shock waves in 2D accretion flows around a stellar mass (10M&sun;) and a supermassive (106M&sun;) black holes. The resultant 2D shocks are unstable with time and the luminosities show the quasi-periodic oscillations (QPOs) with modulations of a factor 2 - 3 and with periods of a tenth seconds to several hours, depending on the black hole masses. These shock oscillation models may not only explain the intermediate frequency QPOs with 1-10 Hz observed in the black hole candidate GRS 1915+105 but also suggest the existence of QPOs with the period of hours in AGNs.
Molteni Diego
Okuda Taichi
Teresi Vincenzo
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