Effects of adiabatic index on the sonic surface and time variability of low angular momentum accretion flows

被引：21
|
作者：
Palit, Ishika [1 ]
Janiuk, Agnieszka [1 ]
Sukova, Petra [2 ]
机构：
[1] Polish Acad Sci, Ctr Theoret Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland
[2] Czech Acad Sci, Astron Inst, Bocni 2 1401, CZ-14100 Prague, Czech Republic
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 487卷 / 01期
关键词：
accretion; accretion discs; black hole physics; hydrodynamics; MHD; shock waves; X-rays: binaries; QUASI-PERIODIC OSCILLATIONS; BLACK-HOLE ACCRETION; X-RAY BINARIES; SPECTRAL PROPERTIES; RXTE OBSERVATIONS; TRANSONIC ACCRETION; FREQUENCY; SHOCKS; DISKS; EVOLUTION;
D O I：
10.1093/mnras/stz1296
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the role of adiabatic index in determining the critical points in the transonic low angular momentum accretion flow on to a black hole. We present the general relativistic 2D hydrodynamic simulations of axisymmetric, inviscid accretion flows in a fixed Kerr black hole gravitational field. Arelativistic fluidwhere its bulk velocity is comparable to the speed of light, flowing in the accretion disc very close to the horizon can be described by an adiabatic index of 4/3 < gamma < 5/3. The time-dependent evolution of the shock position and respective effects on mass accretion rate and oscillation frequency with varying adiabatic index is discussed in the context of the observed microquasars.
引用
收藏
页码：755 / 768
页数：14
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