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On the effects of different perturbations applied to the black hole-torus systems


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

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