We carried out global three-dimensional magnetohydrodynamic simulations of dynamo activities in galactic gaseous disks without assuming equatorial symmetry. Numerical results indicate the growth of azimuthal magnetic fields non-symmetric to the eq...
T. Kawashima   K. Ohsuga   S. Mineshige   T. Yoshida   D. Heinzeller   R. Matsumoto   
ASTROPHYSICAL JOURNAL 752(1) 18 2012年6月 [査読有り]
Radiation spectra of supercritical black hole accretion flows are computed using a Monte Carlo method by post-processing the results of axisymmetric radiation hydrodynamic simulations. We take into account thermal/bulk Comptonization, free-free ab...
Hiroshi Oda   Mami Machida   Kenji E. Nakamura   Ryoji Matsumoto   Ramesh Narayan   
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64(1) 15 2012年2月 [査読有り]
We present global solutions of optically thin, two-temperature black hole accretion disks incorporating magnetic fields. We assume that the (omega) over bar phi-component of the Maxwell stress is proportional to the total pressure, and prescribe t...
Hiroyuki R. Takahashi   Eiji Asano   Ryoji Matsumoto   
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414(3) 2069-2086 2011年7月 [査読有り]
We obtained self-similar solutions of relativistically expanding magnetic loops by assuming axisymmetry and a purely radial flow. The stellar rotation and the magnetic fields in the ambient plasma are neglected. We include the Newtonian gravity of...