Outflows from accreting super-spinars

Abstract

In this paper we continue our study on the accretion process onto super-spinning Kerr objects with no event horizon (super-spinars). We discuss the counterpart of the Bondi accretion onto black holes. We first report the results of our numerical simulations. We found a quasi steady-state configuration for any choice of the parameters of our model. The most interesting feature is the presence of hot outflows. Unlike jets and outflows produced around black holes, which are thought to be powered by magnetic fields and emitted from the poles, here the outflows are produced by the repulsive gravitational force at a small distance from the super-spinar and are ejected around the equatorial plane. In some circumstances, the amount of matter in the outflow is considerable, which can indeed significantly reduce the gas mass accretion rate. Finally, we discuss a possible scenario of the accretion process in more realistic situations, which cannot be simulated by our code.

14 pages, 11 figures. v2: published version with typos corrected

References in corpus (6)

• PLUTO: a Numerical Code for Computational Astrophysics
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• Apparent shape of super-spinning black holes
• Instability of hyper-compact Kerr-like objects
• Instability of charged and rotating naked singularities
• Gravitational instabilities in Kerr space-times

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• Spinning super-massive objects in galactic nuclei up to $a_{\ast }>1$
• 3D simulations of the accretion process in Kerr space-time with arbitrary value of the spin parameter
• Thick disk accretion in Kerr space-time with arbitrary spin parameters
• Violation of the Carter-Israel conjecture and its astrophysical implications