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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Energetics of a black hole-accretion disk system with magnetic connection: Limit of low accretion rate
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Energetics of a black hole-accretion disk system with magnetic connection: Limit of low accretion rate

机译：带有磁性连接的黑洞吸盘系统的能量学：低吸积率的限制

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摘要

We consider the energetics of a black hole-accretion disk system with magnetic connection: a Keplerian disk is connected to a Kerr black hole by a large-scale magnetic field. We assume that 1) the magnetic field is locked to the inner boundary of the disk and corotates with it, and 2) the accretion rate is low, but the accretion from the disk can still provide a sufficient amount of cold plasma particles in the transition region so that the magnetohydrodynamics approximation is valid. By finding solutions that smoothly pass the fast critical point near the equatorial plane, we find that a system with a fast rotating black hole and that with a slow rotating black hole behave very differently. For a black hole with a > a(cr) equivalent to 0. 3594 M, where M is the mass and a is the specific angular momentum of the black hole, the spinning energy of the black hole is efficiently extracted and transported to the disk, thus increasing the radiation efficiency of the disk by orders of magnitude. For a black hole with 0 less than or equal to a < a(cr), the inner region of the disk is disrupted by the magnetic field and the inner boundary moves out to a radius where the angular velocity of the disk is equal to the spinning angular velocity of the black hole. As a result, the disk may have an extremely low radiation efficiency if 0 less than or equal to a/M much less than 1.
机译：我们考虑具有磁性连接的黑洞吸积盘系统的能量学：开普勒盘通过大范围的磁场连接到Kerr黑洞。我们假设1）磁场被锁定到磁盘的内部边界并与其一起旋转，并且2）吸积率较低，但是磁盘的吸积仍然可以在过渡过程中提供足够数量的冷等离子体粒子区域，以便磁流体动力学近似有效。通过找到能够顺利通过赤道平面附近的快速临界点的解决方案，我们发现具有快速旋转黑洞和具有缓慢旋转黑洞的系统的行为有很大不同。对于a> a（cr）等于0的黑洞。3594 M，其中M是质量，a是黑洞的比角动量，黑洞的旋转能量被有效地提取并传输到磁盘上，从而将磁盘的辐射效率提高了几个数量级。对于0小于或等于a

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