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arXiv 0705.1339astro-ph
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4C 74.26中的发光X射线热点:同步辐射还是逆康普顿辐射?

The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?

M. C. Erlund, A. C. Fabian, Katherine M. Blundell, C. Moss, D. R. Ballantyne

摘要:

我们报告发现了一个X射线对应的南部无线电热点的最大的已知射电类星体4C 74.26(其红移为z=0.104)。XMM-牛顿和钱德拉的图像都揭示了X射线热点和MERLIN成像的无线电热点之间相同的显著(10角秒,即19千秒差距)偏移。X射线发射的峰值可能是由于同步加速器或逆康普顿发射。如果是同步辐射,热点代表粒子加速的位置,而偏移量则来自于表现出Scheuer的“牙医钻头”效应的射流,或者是一个动量小于周围鞘的快速脊柱,这就产生了无线电热点。如果发射是由逆康普顿过程产生的,那么它一定是减速相对论流中CMB的逆康普顿散射,这意味着喷流在至少800 kpc的距离上是相对论的(γ>= 2)。我们的分析,包括来自利物浦望远镜的光学数据,排除了X射线发射的背景活动星系核,并证实了其作为热点的性质,使其成为迄今为止探测到的最明亮的X射线热点。

英文摘要:

We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (whose redshift is z=0.104). Both XMM-Newton and Chandra images reveal the same significant (10arcsec, i.e. 19kpc) offset between the X-ray hotspot and the radio hotspot imaged with MERLIN. The peak of the X-ray emission may be due to synchrotron or inverse-Compton emission. If synchrotron emission, the hotspot represents the site of particle acceleration and the offset arises from either the jet exhibiting Scheuer's `dentist's drill' effect or a fast spine having less momentum than the sheath surrounding it, which creates the radio hotspot. If the emission arises from the inverse-Compton process, it must be inverse-Compton scattering of the CMB in a decelerating relativistic flow, implying that the jet is relativistic (Gamma >= 2) out to a distance of at least 800kpc. Our analysis, including optical data from the Liverpool Telescope, rules out a background AGN for the X-ray emission and confirms its nature as a hotspot, making it the most X-ray luminous hotspot yet detected.

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