垂直磁化黑洞附近的赤道流出
Magnetically Ejected Disks: Equatorial Outflows Near Vertically Magnetized Black Hole
摘要：
黑洞从周围环境吸引气体物质。由于电流在黑洞附近的高导电环境中流动，宇宙等离子体在很大程度上被电离和磁化;吸积过程然后将磁通量带到事件视界$r\simeq R_+$上。另一方面，磁压力作用于吸积。它不仅可以阻止流入，而且如果磁斥力占上风，它甚至可以将等离子体推离黑洞。黑洞本身并不拥有磁场。在这方面的贡献，我们展示了一个例子，赤道外流驱动的大规模磁场。我们开始我们的计算与球对称分布的气体，从一个很大的距离，$r\gg R_+$流到域。在流稳定（邦迪）解决方案，我们施加一个轴对称配置的均匀（沃尔德）磁场与旋转轴的黑洞。然后，我们演变的初始配置数值采用MHD代码，接近力的理想导电流体的限制。我们观察到磁力线如何开始与等离子体吸积，同时赤道间歇性流出发展并继续将一些物质从黑洞中喷出。
英文摘要：
Black holes attract gaseous material from the surrounding environment. Cosmic plasma is largely ionized and magnetized because of electric currents flowing in the highly conductive environment near black holes; the process of accretion then carries the magnetic flux onto the event horizon, $r\simeq R_+$. On the other hand, magnetic pressure acts against accretion. It can not only arrest the inflow but it can even push the plasma away from the black hole if the magnetic repulsion prevails. The black hole does not hold the magnetic field by itself. In this contribution we show an example of an equatorial outflow driven by a large scale magnetic field. We initiate our computations with a spherically symmetric distribution of gas, which flows onto the domain from a large distance, $r\gg R_+$. After the flow settles in a steady (Bondi) solution, we impose an axially symmetric configuration of a uniform (Wald) magnetic field aligned with the rotation axis of the black hole. Then we evolve the initial configuration numerically by employing the MHD code that approaches the force-free limit of a perfectly conducting fluid. We observe how the magnetic lines of force start accreting with the plasma while an equatorial intermittent outflow develops and goes on ejecting some material away from the black hole.
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