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arXiv 0806.2545astro-ph
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用极高能gamma-ray耀斑测量AGN中心发动机的参数

Measuring parameters of AGN central engines with very high energy gamma-ray flares

A. Neronov, D. Semikoz, S. Sibiryakov

摘要:

讨论了一个由blazar中心引擎决定变率时间的blazar甚高能(VHE)辐射的“紧凑源”模型。在这个模型中,电子或质子在超大质量黑洞附近加速后,在辐射效率低的吸积流中产生电磁级联。假设这样一个模型的TeV耀变体PKS 2155-304,我们表明,从这个源的明亮的耀斑期间观察到的TeV伽马射线信号的可变性,如最小的可变性时间尺度和子耀斑的重现期,约束的质量和角动量的超大质量黑洞。

英文摘要:

We discuss a "compact source" model of very high energy (VHE) emission from blazars in which the variability time is determined by the blazar central engine. In this model electron or proton acceleration close to the supermassive black hole is followed by the development of electromagnetic cascade in a radiatively inefficient accretion flow. Assuming such a model for the TeV blazar PKS 2155-304, we show that the variability properties of the TeV gamma-ray signal observed during a bright flare from this source, such as the minimal variability time scale and the recurrence period of the sub-flares, constrain the mass and the angular momentum of the supermassive black hole.

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