Outflows from accreting super-spinars

被引:28
作者
Bambi, Cosimo [1 ]
Harada, Tomohiro [2 ]
Takahashi, Rohta [3 ]
Yoshida, Naoki [1 ]
机构
[1] Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778583, Japan
[2] Rikkyo Univ, Dept Phys, Tokyo 1718501, Japan
[3] Inst Phys & Chem Res, Cosm Radiat Lab, Wako, Saitama 3510198, Japan
关键词
GRAVITATIONAL COLLAPSE; NAKED SINGULARITIES; BLACK-HOLE; INSTABILITY;
D O I
10.1103/PhysRevD.81.104004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we continue our study on the accretion process onto superspinning 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.
引用
收藏
页数:12
相关论文
共 31 条
  • [1] [Anonymous], 2008, POS BHGRS
  • [2] BAMBI C, ARXIV09083238
  • [3] BAMBI C, 2010, P 19 WORKSH GEN REL, P109
  • [4] Accretion process onto super-spinning objects
    Bambi, Cosimo
    Freese, Katherine
    Harada, Tomohiro
    Takahashi, Rohta
    Yoshida, Naoki
    [J]. PHYSICAL REVIEW D, 2009, 80 (10):
  • [5] Apparent shape of super-spinning black holes
    Bambi, Cosimo
    Freese, Katherine
    [J]. PHYSICAL REVIEW D, 2009, 79 (04):
  • [6] Numerical {3+1} general relativistic hydrodynamics: A local characteristic approach
    Banyuls, F
    Font, JA
    Ibanez, JM
    Marti, JM
    Miralles, JA
    [J]. ASTROPHYSICAL JOURNAL, 1997, 476 (01) : 221 - 231
  • [7] Instability of hyper-compact Kerr-like objects
    Cardoso, Vitor
    Pani, Paolo
    Cadoni, Mariano
    Cavaglia, Marco
    [J]. CLASSICAL AND QUANTUM GRAVITY, 2008, 25 (19)
  • [8] GLOBAL STRUCTURE OF KERR FAMILY OF GRAVITATIONAL FIELDS
    CARTER, B
    [J]. PHYSICAL REVIEW, 1968, 174 (05): : 1559 - +
  • [9] AXISYMMETRIC BLACK HOLE HAS ONLY 2 DEGREES OF FREEDOM
    CARTER, B
    [J]. PHYSICAL REVIEW LETTERS, 1971, 26 (06) : 331 - +
  • [10] Chandrasekhar S., 1985, The Mathematical Theory of Black Holes