Radiatively-driven black hole winds revisited
Radiatively-driven black hole winds revisited
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重新审视辐射驱动的黑洞风
DOI:
10.1093/mnras/stab346
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
R. Yamamoto and J. Fukue
中科院分区:
文献类型:
--
作者:
Hanawa Tomoyuki;Kudoh Takahiro;Tomisaka Kohji;R. Yamamoto and J. Fukue
We examine general relativistic radiatively-driven spherical winds, using the basic equations for relativistic radiation hydrodynamics under the moment formalism. Moment equations are often closed, using the equilibrium diffusion approximation, which has an acausal problem, and furthermore, gives nodal-type critical points. Instead, we use the non-equilibrium diffusion approximation with a closure relation of a variable Eddington factor,f(τ, β), where τ is the optical depth and β is the flow speed normalized by the speed of light. We then analyse the critical properties in detail for several parameters, and found that there appear saddle-type critical points as well as nodal type and spiral one. The most suitable type is the saddle one appears in a region close to a black hole. We also calculate transonic solutions with typical parameters, and show that the luminosity is almost comparable to the Eddington luminosity, the gas is quickly accelerated in the vicinity of the black hole, and wind terminal speeds are on the order of 0.1–0.3c. These results of radiatively-driven black hole winds can be applied e.g. to ultra-fast outflows, which are supposed to be fast outflows from the vicinity of supermassive black holes.
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DOI:
10.1086/170781
发表时间:
1991
期刊:
The Astrophysical Journal
影响因子:
--
作者:
L. Nobili;R. Turolla;L. Zampieri
通讯作者:
L. Zampieri
DOI:
10.1086/157902
发表时间:
1980
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Mihalas
通讯作者:
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DOI:
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发表时间:
2020
期刊:
影响因子:
--
作者:
Lemon C;Anguita T;Auger-Williams M W;Courbin F;Galan A;McMahon R;Neira F;Oguri M;Schechter P;Shajib A;Treu T;Agnello A;Spiniello C;Shoji Kato and Jun Fukue
通讯作者:
Shoji Kato and Jun Fukue
影响因子:
4.8
作者:
Mukesh K. Vyas;I. Chattopadhyay
通讯作者:
I. Chattopadhyay
DOI:
10.1088/0004-637x/694/1/492
发表时间:
2008
期刊:
The Astrophysical Journal
影响因子:
--
作者:
I. Chattopadhyay;D. Ryu
通讯作者:
D. Ryu