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arXiv 1002.4653astro-ph.HE
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光学薄磁支撑双温黑洞吸积盘的热平衡

Thermal Equilibria of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks

Hiroshi Oda, Mami Machida, Kenji E. Nakamura, Ryoji Matsumoto

摘要:

我们得到了光学薄,双温黑洞吸积盘纳入磁场的热平衡解。本研究的主要目的是解释亮/硬状态期间观察到的星系黑洞候选人的亮/慢过渡。我们假设能量从离子到电子的转移是通过库仑碰撞发生的。韧致辐射、同步辐射和逆康普顿散射被认为是辐射冷却过程。为了完成基本方程组,我们指定的磁通量平流率。我们发现磁性支持(低β),热稳定的解决方案。在这些解决方案中,通过耗散湍流磁场的总热量进入电子并平衡辐射冷却。低$β$的解决方案扩展到高质量吸积率和电子温度是适度冷。在明亮/坚硬状态下观察到的X射线光谱中的高亮度和适度高的能量截止可以通过低β溶液来解释。

英文摘要:

We obtained thermal equilibrium solutions for optically thin, two-temperature black hole accretion disks incorporating magnetic fields. The main objective of this study is to explain the bright/hard state observed during the bright/slow transition of galactic black hole candidates. We assume that the energy transfer from ions to electrons occurs via Coulomb collisions. Bremsstrahlung, synchrotron, and inverse Compton scattering are considered as the radiative cooling processes. In order to complete the set of basic equations, we specify the magnetic flux advection rate. We find magnetically supported (low-beta), thermally stable solutions. In these solutions, the total amount of the heating via the dissipation of turbulent magnetic fields goes into electrons and balances the radiative cooling. The low-$β$ solutions extend to high mass accretion rates and the electron temperature is moderately cool. High luminosities and moderately high energy cutoffs in the X-ray spectrum observed in the bright/hard state can be explained by the low-beta solutions.

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