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∗∣≤1 (black holes) and with ∣a∗∣>1 (super-spinars). Our full three-dimensional simulations confirm the formation of equatorial outflows for high values of ∣a∗∣, as found in our previous work in 2.5 dimensions. We show that the critical value of ∣a∗∣ 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∗∣≤1 for astrophysical black hole candidates.
@article{arxiv.1006.4296,
title = {3D simulations of the accretion process in Kerr space-time with arbitrary value of the spin parameter},
author = {Cosimo Bambi and Naoki Yoshida},
journal= {arXiv preprint arXiv:1006.4296},
year = {2010}
}