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arXiv 1107.0910astro-ph.HE
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被动超大质量黑洞的VHE gamma-ray辐射:对NGC 1399的约束

VHE gamma-ray Emission from Passive Supermassive Black Holes: Constraints for NGC 1399

G. Pedaletti, S. J. Wagner, F. M. Rieger

摘要:

极高能(VHE;>100 GeV)的伽马射线预计将从超大质量黑洞(SMBH)附近发射出来,而不管它们的活动状态如何。在旋转SMBH的磁层中,带电粒子的有效加速可以通过各种过程发生。这些粒子的能量可以达到E~10^{19}eV。这些粒子的VHE伽马射线发射则可以通过轻子或强子过程进行。因此,被动系统,缺乏强光子场允许VHE伽马射线逃逸,预计将被切伦科夫望远镜探测到。我们目前的结果,从最近的VHE实验的被动SMBH在附近的椭圆星系NGC 1399。没有发现伽马射线信号,也没有被H.E.S.S.实验也没有在这里分析的费米数据。我们讨论了系统的物理特性的可能影响。我们的结论是,在粒子在磁层真空间隙中加速的情况下,只有0.3分之一的间隙可用于粒子加速,这表明该系统不太可能将质子加速到E~10^{19} eV。

英文摘要:

Very high energy (VHE; >100 GeV) gamma-rays are expected to be emitted from the vicinity of super-massive black holes (SMBH), irrespective of their activity state. In the magnetosphere of rotating SMBH, efficient acceleration of charged particles can take place through various processes. These particles could reach energies up to E~10^{19}eV. VHE gamma-ray emission from these particles is then feasible via leptonic or hadronic processes. Therefore passive systems, where the lack of a strong photon field allows the VHE gamma-rays to escape, are expected to be detected by Cherenkov telescopes. We present results from recent VHE experiments on the passive SMBH in the nearby elliptical galaxy NGC 1399. No gamma-ray signal has been found, neither by the H.E.S.S. experiment nor in the Fermi data analyzed here. We discuss possible implications for the physical characteristics of the system. We conclude that in a scenario where particles are accelerated in vacuum gaps in the magnetosphere, only a fraction ~0.3 of the gap is available for particle acceleration, indicating that the system is unlikely to be able to accelerate protons up to E~10^{19} eV.

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