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Where is a Marginally Stable Orbit in Luminous Accretion Disk
Ken-ya Watarai,Shin Mineshige 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
Impressed by a widespread misunderstanding of the issue, we return to the old question concerning the location of the inner edge of the accretion disk around a black hole. That is, \the inner edge does not coincide with the location of the inner most stable Keplerian circular orbit." We show that the ow does not have a potential minimum for accretion rates _ > 10LE=c2, with LE being the Eddington luminosity and c being the speed of light. This property is realized even for relatively small viscosity parameters (i.e., 0:01) because of the eect of the pressure gradient. In conclusion, an argument based on the last circular orbit of a test particle cannot give a correct inner boundary for the super-critical ow, and the inner edge should be determined in connection with radiation eciency.
Observational Properties of Supercritical Accretion Flows
Ken-ya Watarai 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
I would like to review the observational properties of supercritical accretion °ows as an origin of high luminosity sources, e.g., galactic microquasars, ultraluminous X-ray sources near galaxies, or narrow line Seyfert 1 galaxies. Models of supercritical accretion °ows have been investigated by many authors; however, the observational properties have not been su±ciently studied. In particular, the geometrical thickness of the °ow strongly aects the observational spectrum because, when the viewing angle in the disk is high, the outer disk blocks emission from the disk inner region; i.e., the self-occultation eect will be important. Even if I take into account the eect of general relativity (light bending, Doppler boosting), the geometrical eect of the supercritical accretion °ows signi.cantly changes the spectrum for high viewing angles: spectrum softening occurs due to the self-occultation eect. In addition, several observational implications and applications of supercritical accretion °ows are presented in this paper.