3D simulations of the accretion process in Kerr space-time with arbitrary value of the spin parameter

Abstract

We present the results of three-dimensional general relativistic hydrodynamic simulations of adiabatic and spherically symmetric accretion in Kerr space-time. We consider compact objects with spin parameter $|a_{\ast }|\le 1$ (black holes) and with $|a_{\ast }|>1$ (super-spinars). Our full three-dimensional simulations confirm the formation of equatorial outflows for high values of $|a_{\ast }|$, as found in our previous work in 2.5 dimensions. We show that the critical value of $|a_{\ast }|$ determining the onset of powerful outflows depends mainly on the radius of the compact object. The phenomenon of equatorial outflows can hardly occur around a black hole and may thus be used to test the bound $|a_{\ast }|\le 1$ for astrophysical black hole candidates.

13 pages, 9 figures. v2: refereed version

References in corpus (2)

• Apparent shape of super-spinning black holes
• Outflows from accreting super-spinars

Cited by in corpus (3)

• Evolution of the spin parameter of accreting compact objects with non-Kerr quadrupole moment
• Spinning super-massive objects in galactic nuclei up to $a_{\ast }>1$
• Thick disk accretion in Kerr space-time with arbitrary spin parameters