VERY HIGH ENERGY γ-RAY EMISSION FROM PASSIVE SUPERMASSIVE BLACK HOLES: CONSTRAINTS FOR NGC 1399
VERY HIGH ENERGY γ-RAY EMISSION FROM PASSIVE SUPERMASSIVE BLACK HOLES: CONSTRAINTS FOR NGC 1399
复制标题
被动超大质量黑洞的极高能量 γ 射线发射：NGC 1399 的限制
DOI：
10.1088/0004-637x/738/2/142
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
F. Rieger
中科院分区：
文献类型：
--
作者：
G. Pedaletti;G. Pedaletti;S. Wagner;F. Rieger
超能γ射线（VHE, bbb100 GeV）预计将从超大质量黑洞（SMBHs）附近发射，无论其活动状态如何。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 ~ 1019 eV。这些粒子通过轻子或强子过程发射VHE γ射线是可行的。因此，切伦科夫望远镜有望探测到无源系统，在无源系统中，由于缺乏强光子场，VHE γ射线得以逃逸。我们介绍了最近在附近的椭圆星系ngc1399的被动SMBH上进行的VHE实验的结果。无论是在H.E.S.S.实验中还是在这里分析的费米数据中，都没有发现γ射线信号。我们讨论了对系统物理特性可能产生的影响。我们得出结论，在粒子在磁层真空间隙中加速的情况下，只有一小部分~ 0.3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 ~ 1019 eV。
Very high energy (VHE, >100 GeV) γ-rays are expected to be emitted from the vicinity of supermassive black holes (SMBHs), 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 ∼ 1019 eV. VHE γ-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 γ-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 γ-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 ∼ 1019 eV.
DOI：
10.1086/522938
发表时间：
2007-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
K. Gebhardt;T. Lauer;J. Pinkney;R. Bender;D. Richstone;M. Aller;G. Bower;A. Dressler;S. Faber;A. Filippenko;R. Green;L. Ho;J. Kormendy;C. Siopis;S. Tremaine
通讯作者：
K. Gebhardt;T. Lauer;J. Pinkney;R. Bender;D. Richstone;M. Aller;G. Bower;A. Dressler;S. Faber;A. Filippenko;R. Green;L. Ho;J. Kormendy;C. Siopis;S. Tremaine