被日冕磁场加速的喷流的能量
The power of the jets accelerated by the coronal magnetic field
摘要：
有人认为，大尺度磁场可以有效地被盘上方的日冕向内拖曳，即，所谓的“日冕机制”（Beckwith，Hawley，\& Krolik 2009），它提供了一种方法来解决几何薄吸积盘中的场平流的困难。在这种情况下，磁压力应低于电晕中的气体压力。我们估计的最大功率的射流加速的磁场平流的日冕。除了a>0.8的快速旋转黑洞外，Blandford-Payne（BP）喷流功率总是高于Blandford-Znajek（BZ）喷流功率.最大喷流功率总是很低的，小于0.05爱丁顿光度，即使是一个极端的克尔黑洞，这是不够的，观察到的强喷流在一些耀变体与喷流功率$\sim 0.1-1$爱丁顿光度（甚至更高）。这意味着这些强大的喷流不能被日冕场加速。我们认为，由吸积盘向内拖曳的磁场可能加速耀变体中的喷流（如果不是全部的话，至少是最强大的喷流）。
英文摘要：
It was suggested that the large scale magnetic field can be dragged inwards efficiently by the corona above the disc, i.e., the so called "coronal mechanism" (Beckwith, Hawley, \& Krolik 2009), which provides a way to solve the difficulty of field advection in a geometrically thin accretion disc. In this case, the magnetic pressure should be lower than the gas pressure in the corona. We estimate the maximal power of the jets accelerated by the magnetic field advected by the corona. The Blandford-Payne (BP) jet power is found always to be higher than the Blandford-Znajek (BZ) jet power, except for a rapidly spinning black hole with a>0.8. The maximal jet power is always low, less than 0.05 Eddington luminosity, even for an extreme Kerr black hole, which is insufficient for the observed strong jets in some blazars with jet power $\sim 0.1-1$ Eddington luminosity (or even higher). It implies that these powerful jets cannot be accelerated by the coronal field. We suggest that, the magnetic field dragged inward by the accretion disc with magnetically outflows may accelerate the jets (at least for the most powerful jets, if not all) in the blazars.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
