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arXiv 0709.2778astro-ph
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寻找被动超大质量黑洞的甚高能gamma-ray辐射

A search for Very High Energy gamma-ray emission from Passive Super-massive Black Holes

G. Pedaletti, S. Wagner, W. Benbow

摘要:

活动星系核(AGN)的喷流是非常高能量(VHE; >100 GeV)伽马射线的发射源。VHE辐射预计也会从超大质量黑洞(SMBH)附近发射,而不管它们的活动状态如何。吸积SMBH旋转并产生偶极磁场。在旋转的黑洞的磁层中,粒子的加速可以在场隙中发生。这些粒子的VHE发射是可行的轻子或强子过程。因此,静态系统,其中缺乏强光子场允许VHE发射逃逸,是发射的候选者。H.E.S.S.实验观测到了附近星系NGC 1399中的被动SMBH。没有VHE伽马射线信号被观察到从星系核。NGC 1399观测的约束条件进行了讨论的背景下,VHE伽马射线发射的生产不同的机制。

英文摘要:

Jets of Active Galactic Nuclei (AGN) are established emitters of very high energy (VHE; >100 GeV) gamma-rays. VHE radiation is also expected to be emitted from the vicinity of super-massive black holes (SMBH), irrespective of their activity state. Accreting SMBH rotate and generate a dipolar magnetic field. In the magnetosphere of the spinning black hole, acceleration of particles can take place in the field gaps. VHE emission from these particles is feasible via leptonic or hadronic processes. Therefore quiescent systems, where the lack of a strong photon field allows the VHE emission to escape, are candidates for emission. The H.E.S.S. experiment has observed the passive SMBH in the nearby galaxy NGC 1399. No VHE gamma-ray signal is observed from the galactic nucleus. Constraints set by the NGC 1399 observations are discussed in the context of different mechanisms for the production of VHE gamma-ray emission.

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