静止黑洞双星中的磁致俘获：形成方案、可观测特征和潜在PeVatrons
Magnetically Arrested Disks in Quiescent Black-Hole Binaries: Formation Scenario, Observable Signatures, and Potential PeVatrons
摘要：
我们建议磁制动盘（MAD）在静止的黑洞（BH）作为起源的多波长发射的双星，并认为这类源可以支配周围的膝盖宇宙射线谱。银河系BH双星在静止状态下的X射线光度远低于爱丁顿光度，因此，在内部区域形成了辐射效率低下的吸积流（RIAF）。RIAF中的强热压力和湍流压力产生外流，这可以产生大规模的极向磁场。这些场被快速入流运动带到BH附近，形成MAD。在MAD内部，非热质子和电子被磁重联自然加速，或者被湍流随机加速。热电子和非热电子通过同步辐射发射宽带光子，这与静态BH X射线双星的光学和X射线数据基本一致。此外，质子被加速到PeV能量，并从这些MAD中扩散逃逸，这可以解释膝盖能量附近的宇宙射线强度。
英文摘要：
We propose magnetically arrested disks (MADs) in quiescent black-hole (BH) binaries as the origin of the multiwavelength emission, and argue that this class of sources can dominate the cosmic-ray spectrum around the knee. X-ray luminosities of Galactic BH binaries in the quiescent state are far below the Eddington luminosity, and thus, radiatively inefficient accretion flows (RIAFs) are formed in the inner region. Strong thermal and turbulent pressures in RIAFs produce outflows, which can create large-scale poloidal magnetic fields. These fields are carried to the vicinity of the BH by the rapid inflow motion, forming a MAD. Inside the MAD, non-thermal protons and electrons are naturally accelerated by magnetic reconnections or stochastic acceleration by turbulence. Both thermal and non-thermal electrons emit broadband photons via synchrotron emission, which are broadly consistent with the optical and X-ray data of the quiescent BH X-ray binaries. Moreover, protons are accelerated up to PeV energies and diffusively escape from these MADs, which can account for the cosmic-ray intensity around the knee energy.
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