Results are presented from a time-dependent, numerical investigation of spherical accretion on to black holes, within the framework of relativistic radiation hydrodynamics. We have studied the stability of self-consistent, stationary solutions of black hole accretion with respect to thermal and radiative perturbations, and also the non-linear evolution of unstable, high-temperature models, heated by the hard radiation produced by the accretion flow itself in the inner region near to the horizon. In some cases, a hydrodynamic shock forms at about 10(3)-10(4) Schwarzschild radii, where Compton heating exceeds radiative cooling. The calculations have been made using a suitably designed radiation hydrodynamics code, in which radiative transfer is handled by means of the PSTF moment formalism and which contains an original treatment of the radiation temperature equation.
Time-dependent analysis of spherical accretion on to black holes / Zampieri, L; Miller, John; Turolla, R.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 281:4(1996), pp. 1183-1196. [10.1093/mnras/281.4.1183]
Time-dependent analysis of spherical accretion on to black holes
Miller, John;
1996-01-01
Abstract
Results are presented from a time-dependent, numerical investigation of spherical accretion on to black holes, within the framework of relativistic radiation hydrodynamics. We have studied the stability of self-consistent, stationary solutions of black hole accretion with respect to thermal and radiative perturbations, and also the non-linear evolution of unstable, high-temperature models, heated by the hard radiation produced by the accretion flow itself in the inner region near to the horizon. In some cases, a hydrodynamic shock forms at about 10(3)-10(4) Schwarzschild radii, where Compton heating exceeds radiative cooling. The calculations have been made using a suitably designed radiation hydrodynamics code, in which radiative transfer is handled by means of the PSTF moment formalism and which contains an original treatment of the radiation temperature equation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.