标题： 两个喷气式飞机的故事 显示英文标题

标题： A Tale of Two Jets

摘要： 其中最有趣的一种高能天体物理现象是从高度局部化的天空位置发射出的相对论性喷流。 这种喷流在自然界中很常见，在高红移和多种波长范围内均被观测到。 它们的确切产生机制仍然是个谜，但人们普遍认为它们是由黑洞驱动的。 我们在此总结了Palenzuela、Lehner和Liebling最近的模拟研究，这些研究揭示了喷流产生的机制。 这些作者研究了两个非自旋黑洞在磁场所中的合并情况，该磁场垂直于轨道平面，并由环绕双星系统的吸积盘锚定，采用了“力自由”近似法。 他们发现，每个黑洞本质上都像一根“吸管”，在黑洞逐渐靠近的过程中搅动着质心周围的磁场线。 然后，磁场线的扭曲在每个黑洞周围产生了喷流，尽管这些黑洞本身并不旋转。 他们的模拟显示了这种双喷流几何结构的形成过程，以及当黑洞由于引力波辐射而合并时，如何过渡到单喷流结构。 显示英文摘要

摘要： One of the most interesting high-energy, astrophysical phenomena are relativistic jets emitted from highly localized sky location. Such jets are common in Nature, observed to high redshift and in a range of wavelengths. Their precise generation mechanism remains a bit of a mystery, but they are generically believed to be powered by black holes. We here summarize the recent simulations of Palenzuela, Lehner and Liebling that shed light on the jet generation mechanism. These authors studied the merger of two non-spinning black holes in the presence of a magnetic field, perpendicular to the orbital plane and anchored by a circumbinary accretion disk, in the "force-free" approximation. They found that each black hole essentially acts as a "straw" that stirs the magnetic field lines around the center of mass as the black holes inspiral. The twisting of the magnetic field lines then generates jets around each black hole, even though these are not spinning. Their simulations show the formation of such a dual jet geometry and how it transitions to a single jet one, as the black holes merge due to gravitational wave emission.