The dynamical evolution of the black hole–torus system perturbed by a Bondi–Hoyle accretion

摘要: The existence of the black hole (BH)–torus system has been given a considerable attention to explain variability X-ray and Gamma-ray (γ-ray) data. perturbation this by Bondi–Hoyle accretion leads an instability which might be used understand dynamics binaries γ-ray burst (GRB). is Papaloizou–Pringle type fastest growing mode corresponds m = 1. In paper, we put forward scenario in stable BH–torus perturbed matter coming from red giants due stellar winds. We model find out how changes depending on rest-mass density initial estimate maximum perturbation, ρp, creates quasi-periodic oscillation without having shock cone around BH for fixed ρc (ρc torus). have found that with density, ρp < 100ρatm (ρatm atmosphere), any Mach number best formation oscillating torus BH. Otherwise, appears downstream region accreted domain. It also observed while 100ρatm.