arXiv 0704.34802007-04astro-ph

正常星系核的瞬态X射线辐射

Transient X-ray Emission from Normal Galactic Nuclei

A. Y. L. Wong, Y. F. Huang, K. S. Cheng

备注：: 5 figures, accepted by A&A
发表信息：: Astron.Astrophys.472:93,2007
DOI：: 10.1051/0004-6361:20077222

摘要：

近年来，在光学非活动星系核中观测到了X射线瞬变现象。解释这类现象最流行的模型是传统的潮汐扰动模型。在这个模型中，当恒星在黑洞潮汐半径内运动时，部分恒星物质会通过一个吸积盘落入黑洞，从而产生明亮的耀斑。我们提出X射线辐射不一定只来自于吸积盘的辐射。相反，它可能与喷气式飞机有关。当喷流在星际介质中行进时，会产生激波，预计会产生同步辐射。将模型的光变曲线和同步辐射谱与观测数据进行了比较，发现模型能很好地解释观测到的光变曲线和后期光谱。我们的模型预测，这些短暂的活动星系核可能是未来的伽马射线卫星源，如GLAST和发射区域将随着时间的推移而扩大。

英文摘要：

X-ray transients appeared in optically non-active galactic nuclei have been observed in recent years. The most popular model explaining this kind of phenomena is the conventional tidal disruption model. In this model, when a star moves within the tidal radius of a black hole, part of the star materials will fall into the black hole through an accretion disk, which gives rise to the luminous flare. We propose that the X-ray emission may not necessarily come from radiation of the accretion disk alone. Instead, it may be related to a jet. As the jet travels in the interstellar medium, a shock is produced and synchrotron radiation is expected. We compared the model light curve and the synchrotron radiation spectrum with the observed data, and find that our model explains the observed light curve and late-time spectrum well. Our model predicts that these transient active galactic nuclei could be sources of the future gamma-ray satellites, e.g. GLAST and the emission region will be expanding with time.

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