Standing Shocks in Transmagnetosonic Accretion Flows onto a Black Hole
Standing Shocks in Transmagnetosonic Accretion Flows onto a Black Hole
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DOI：
10.1086/500107
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
M. Takahashi;Junya Goto;K. Fukumura;D. Rilett;S. Tsuruta
中科院分区：
文献类型：
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作者：
M. Takahashi;Junya Goto;K. Fukumura;D. Rilett;S. Tsuruta
提出了静止和轴对称磁流体(MHD)吸积流在黑洞上形成快慢磁声激波的方法。激波黑洞吸积解必须通过激波位置内外某些位置的磁声点。分析了磁声点处的临界条件和激波条件。然后，我们给出了强激波对流动参数的限制。我们还表明，当能量流入很高且数密度很小时，可以得到非常热的冲击等离子体。这样的MHD激波可以出现在非常接近事件视界的地方，可以预期它是高能排放源。在Schwarzschild的情况下，给出了激波MHD吸积流的例子。
Fast and slow magnetosonic shock formation is presented for stationary and axisymmetric magnetohydrodynamic (MHD) accretion flows onto a black hole. The shocked black hole accretion solution must pass through magnetosonic points at some locations outside and inside the shock location. We analyze critical conditions at the magnetosonic points and the shock conditions. Then, we show the restrictions on the flow parameters for strong shocks. We also show that a very hot shocked plasma is obtained for a very high energy inflow with a small number density. Such a MHD shock can appear very close to the event horizon and can be expected as a source of high-energy emissions. Examples of shocked MHD accretion flows are presented in the Schwarzschild case.