Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341026f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #410.26; Bulletin of the American Astronomical Society, Vol. 41, p.215
Astronomy and Astrophysics
Astronomy
Scientific paper
We present two- and three-dimensional general relativistic magnetohydrodynamic (GRMHD) numerical simulations of radiatively-cooled black-hole accretion disks. The numerical code used for these simulations combines a total-energy-conserving MHD formulation with a radiative cooling function, which approximates bremsstrahlung, synchrotron, and Compton effects. We compare our results to predictions of the magnetically-dominated accretion flow (MDAF) model, which has previously been proposed as an explanation of the Hard state in black-hole X-ray binaries (XRBs). By varying the input conditions of our simulations, we are able to explore a range of values for the stress parameter and accretion rate, which are the principle variables affecting the size and properties of the MDAF region. If available, we may also show synthetic broadband spectra of these models, which can be compared with real spectra of XRBs in the Hard state.
Fragile Patrick Christopher
Meier David L.
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