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arXiv 1004.0702astro-ph.HE
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考虑传导和自洽馈电的Sgr A流入流出模型

Inflow-Outflow Model with Conduction and Self-Consistent Feeding for Sgr A*

Roman V. Shcherbakov, Frederick K. Baganoff

备注：
6 pages, 5 figures, accepted by ApJ
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摘要：

我们提出了一个双温度径向流入流出模型Sgr A* 附近的自洽喂养和传导。来自单个恒星的恒星风被认为可以找到质量注入和能量注入的速率。这些源项有助于部分消除流入的边界条件。电子热传导是抑制吸积的关键。能量从几个引力半径向外扩散，在几角秒内释放更多的气体，并将吸积速率限制在<1%的邦迪速率。我们成功地拟合了从广泛的钱德拉观测中发现的X射线表面亮度轮廓，并揭示了中心的X射线点源。超分辨率技术允许我们推断点源的存在并估计点源的未吸收光度$L\approx4\cdot10^{32}{\rm erg s^{-1}}$。所采用的相对论热容量和电子的直接加热自然导致黑洞附近的低电子温度$T_e\approx 4\cdot10^{10}$ K。在同一个模型中，我们拟合86 GHz的光学厚发射，并获得法拉第旋转测量的数量级协议，从而实现适合于所有半径的单一吸积模型。

英文摘要：

We propose a two-temperature radial inflow-outflow model near Sgr A* with self-consistent feeding and conduction. Stellar winds from individual stars are considered to find the rates of mass injection and energy injection. These source terms help to partially eliminate the boundary conditions on the inflow. Electron thermal conduction is crucial for inhibiting the accretion. Energy diffuses out from several gravitational radii, unbinding more gas at several arcseconds and limiting the accretion rate to <1% of Bondi rate. We successfully fit the X-Ray surface brightness profile found from the extensive Chandra observations and reveal the X-Ray point source in the center. The super-resolution technique allows us to infer the presence and estimate the unabsorbed luminosity $L\approx4\cdot10^{32}{\rm erg s^{-1}}$ of the point source. The employed relativistic heat capacity and direct heating of electrons naturally lead to low electron temperature $T_e\approx 4\cdot10^{10}$ K near the black hole. Within the same model we fit 86 GHz optically thick emission and obtain the order of magnitude agreement of Faraday rotation measure, thus achieving a single accretion model suitable at all radii.

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