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arXiv 1808.03075astro-ph.HE
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闪电黑洞作为未确认的TeV源

Lightning black holes as unidentified TeV sources

Kouichi Hirotani, Hung-Yi Pu, Satoki Matsushita

摘要:

切伦科夫大气成像望远镜已经揭示了银河系平面上超过100 TeV的源,其中约45%仍然无法识别。然而,无线电观测显示,致密的分子团与18个未识别的TeV源中的67%有关。在本文中,我们提出了一个电子-正电子磁层加速器发射可检测TeV的伽马射线时,一个快速旋转的黑洞进入气体云。由于广义相对论效应在这种磁层轻子加速器方案中起着至关重要的作用,因此辐射发生在事件视界的直接附近,导致点状伽马射线图像。我们表明,它们的γ射线谱有两个峰值约0.1 GeV和0.1 TeV的加速器成为最明亮的质量吸积率时,约0.01%的爱丁顿吸积率。我们比较的结果与其他方案,如宇宙射线强子的情况下,预测一个扩展的形态的伽马射线图像与一个单一的幂律光子谱从GeV到100 TeV。

英文摘要:

Imaging Atmospheric Cherenkov Telescopes have revealed more than 100 TeV sources along the Galactic Plane, around 45% of them remain unidentified. However, radio observations revealed that dense molecular clumps are associated with 67% of 18 unidentified TeV sources. In this paper, we propose that an electron-positron magnetospheric accelerator emits detectable TeV gamma-rays when a rapidly rotating black hole enters a gaseous cloud. Since the general-relativistic effect plays an essential role in this magnetospheric lepton accelerator scenario, the emissions take place in the direct vicinity of the event horizon, resulting in a point-like gamma-ray image. We demonstrate that their gamma-ray spectra have two peaks around 0.1 GeV and 0.1 TeV and that the accelerators become most luminous when the mass accretion rate becomes about 0.01% of the Eddington accretion rate. We compare the results with alternative scenarios such as the cosmic-ray hadron scenario, which predicts an extended morphology of the gamma-ray image with a single power-law photon spectrum from GeV to 100 TeV.

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