Hydrodynamic simulations of viscous accretion flows around black holes

被引:14
|
作者
Giri, Kinsuk [1 ]
Chakrabarti, Sandip K. [1 ,2 ]
机构
[1] SN Bose Natl Ctr Basic Sci, Kolkata 700098, India
[2] Indian Ctr Space Phys, Kolkata 700084, India
关键词
accretion; accretion discs; black hole physics; hydrodynamics; shock waves; STANDING SHOCKS; DISKS; WAVES; WINDS; OSCILLATION; DEPENDENCE; DISCS;
D O I
10.1111/j.1365-2966.2011.20343.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the time evolution of a rotating, axisymmetric, viscous accretion flow around black holes using a grid-based finite difference method. We use the Shakura-Sunyaev viscosity prescription. However, we compare with the results obtained when all the three independent components of the viscous stress are kept. We show that the centrifugal pressure supported shocks became weaker with the inclusion of viscosity. The shock is formed farther out when the viscosity is increased. When the viscosity is above a critical value, the shock disappears altogether and the flow becomes subsonic and Keplerian everywhere except in a region close to the horizon, where it remains supersonic. We also find that as the viscosity is increased, the amount of outflowing matter in the wind is decreased to less than a percentage of the inflow matter. Since the post-shock region could act as a reservoir of hot electrons or the so-called 'Compton cloud', the size of which changes with viscosity, the spectral properties are expected to depend on viscosity strongly: the harder states are dominated by low angular momentum and the low-viscosity flow with significant outflows while the softer states are dominated by the high-viscosity Keplerian flow having very few outflows.
引用
收藏
页码:666 / 678
页数:13
相关论文
共 50 条
  • [1] Smoothed particle hydrodynamic simulations of viscous accretion discs around black holes
    Lanzafame, G
    Molteni, D
    Chakrabarti, SK
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 299 (03) : 799 - 804
  • [2] Standing shocks in viscous accretion flows around black holes
    Gu, WM
    Lu, JF
    [J]. CHINESE PHYSICS LETTERS, 2005, 22 (04) : 1025 - 1028
  • [3] Properties of accretion shock waves in viscous flows around black holes
    Chakrabarti, SK
    Das, S
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 349 (02) : 649 - 664
  • [4] Shocks in relativistic viscous accretion flows around Kerr black holes
    Dihingia, Indu K.
    Das, Santabrata
    Maity, Debaprasad
    Nandi, Anuj
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 488 (02) : 2412 - 2422
  • [5] Periodic mass loss from viscous accretion flows around black holes
    Das, Santabrata
    Chattopadhyay, Indranil
    Nandi, Anuj
    Molteni, D.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 442 (01) : 251 - 258
  • [6] Viscous dissipative two-temperature accretion flows around black holes
    Sarkar, Shilpa
    Chattopadhyay, Indranil
    [J]. JOURNAL OF ASTROPHYSICS AND ASTRONOMY, 2022, 43 (02)
  • [7] Viscous dissipative two-temperature accretion flows around black holes
    SHILPA SARKAR
    INDRANIL CHATTOPADHYAY
    [J]. Journal of Astrophysics and Astronomy, 43
  • [8] Oscillating shocks in the transonic viscous, variable Γ accretion flows around black holes
    Debnath, Sanjit
    Chattopadhyay, Indranil
    Joshi, Raj Kishor
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 528 (03) : 3964 - 3980
  • [9] Hot Accretion Flows Around Black Holes
    Yuan, Feng
    Narayan, Ramesh
    [J]. ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 52, 2014, 52 : 529 - 588
  • [10] Nucleosynthesis in accretion flows around black holes
    Mukhopadhyay, B
    Chakrabarti, SK
    [J]. ASTRONOMY & ASTROPHYSICS, 2000, 353 (03): : 1029 - 1043