Multiwavelength Emission from Magnetically Arrested Disks around Isolated Black Holes
Multiwavelength Emission from Magnetically Arrested Disks around Isolated Black Holes
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DOI：
10.3847/2041-8213/ac35dc
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
S. Kimura;K. Kashiyama;K. Hotokezaka
中科院分区：
文献类型：
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作者：
S. Kimura;K. Kashiyama;K. Hotokezaka
我们讨论了在我们的银河系中识别最近的孤立黑洞（IBH）的前景。IBH从星际介质中吸积气体可能形成磁制动盘（MAD）。我们发现，在MAD的热电子通过热同步辐射过程中发出的光信号，而非热电子通过磁重联加速发出的X射线到MeV的伽马射线范围内的平谱同步辐射。盖亚星表将包括最多1000个1000 kpc以内的IBH，它们分布在赫兹-罗素图中白色矮星（WD）的冷却序列上和周围。这些IBH候选者也应该被eROSITA探测到，它们可以与孤立的WD和中子星区分开来。硬X射线和MeV伽马射线卫星的后续观测将有助于明确识别IBH。
We discuss the prospects for identifying the nearest isolated black holes (IBHs) in our Galaxy. IBHs accreting gas from the interstellar medium likely form magnetically arrested disks (MADs). We show that thermal electrons in the MADs emit optical signals through the thermal synchrotron process while nonthermal electrons accelerated via magnetic reconnections emit a flat-spectrum synchrotron radiation in the X-ray to MeV gamma-ray ranges. The Gaia catalog will include at most a thousand IBHs within ≲1 kpc that are distributed on and around the cooling sequence of white dwarfs (WDs) in the Hertzsprung–Russell diagram. These IBH candidates should also be detected by eROSITA, with which they can be distinguished from isolated WDs and neutron stars. Follow-up observations with hard X-ray and MeV gamma-ray satellites will be useful to unambiguously identify IBHs.