Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1054...25m&link_type=abstract
COOL DISCS, HOT FLOWS: The Varying Faces of Accreting Compact Objects. AIP Conference Proceedings, Volume 1054, pp. 25-32 (2008
Astronomy and Astrophysics
Astrophysics
Magnetohydrodynamics And Plasmas, X-Ray Binaries, Black Holes, Accretion And Accretion Disks, Luminosity And Mass Functions, Radiative Processes, Solar Radiation, Quasars
Scientific paper
Super-Eddington (or supercritical) accretion flow seems to be realized in many astrophysical situations, such as ultra-luminous X-ray sources. We first discuss several noteworthy observable features of the supercritical accretion flow based on the framework of (1) one-dimensional, slim disk model. We expect flatter temperature profile, if the accretion rate exceeds the critical rate, and we find such a signature in the X-ray data of some ULXs. We then examine the data of (2) multi-dimensional, global radiation-hydrodynamic (RHD) simulations of disk accretion. Effects of relativistic beaming and gas outflow are particularly stressed there. Finally, we present our most recent results of (3) global, radiation-magnetohydrodynamic (RMHD) simulations of accretion flow. This model could for the first time reproduce the three different regimes of accretion (supercritical, standard-type, and radiatively inefficient accretion flow) with the same code by varying the density normalization.
Mineshige Shin
Ohsuga Ken
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