On the effects of different perturbations applied to the black hole-torus systems
- Physics & Astronomy International Journal
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Orhan Donmez
Abstract
The presence of the perturbation on the torus around the black hole causes the torus material to be swallowed by the black hole and create a Papaloizou-Pringle Instability (PPI) in a few dynamical times. The growth in an instability and stationary accretion phase reached around the black hole show an indication of the presence of the Quasi-Periodic Oscillation (QPOs). In this paper, we present the 2D numerical hydrodynamical simulations of the torus around the black hole in a fixed space-time on the equatorial plane. We show that m=1 nonaxisymmetric instability and QPOs are presented for the perturbation which is triggered by increasing the angular velocity of torus in equilibrium. Our results indicate that the perturbed black hole-torus system can be a good candidate to explain the high energetic phenomena observed in the center of the galaxies and Active-Galactic Nuclei (AGN).
Keywords
nonaxisymmetric instability, equatorial plane, galaxies, energetic phenomena, space-time, black hole, hydrodynamical equations