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arXiv 0907.1684astro-ph.HEastro-ph.GA
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HESS J1731-347/SNR G353 .6-0.7和中心紧凑源XMMS J173203-344518的X射线发射

X-ray emission from HESS J1731-347/SNR G353.6-0.7 and Central Compact Source XMMS J173203-344518

W. W. Tian, Z. Li, D. A. Leahy, J. Yang, X. J. Yang, R. Yamazaki, D. Lu

摘要:

本文介绍了HESS J1731-347/SNR G353.6-0.7系统的XMM-NEWTOM和朱雀X射线观测以及Delinha CO观测的新结果。我们发现扩展的硬X射线与明亮的扩展TeV源HESS J1731-347和射电SNR的外壳相一致。我们发现,空间分辨X射线谱一般可以用吸收幂律模型来表征,光子指数为~ 2,典型的非热发射。一个明亮的X射线紧凑源,XMMS J173203-344518,也被检测到附近的SNR的中心。我们没有发现这个源的射电对应物或扩展X射线形态的证据,这使得它不太可能是脉冲星风星云(PWN)。源的光谱可以很好地拟合的吸收黑体的温度为~ 0.5 keV加上幂律尾的光子指数为~ 5,让人想起的X射线发射的磁星。对HESS源内部的CO观测显示,在-20+/-4 km s^{-1}处有一个明亮的云成分,它可能与SNR位于相同的距离,约为3.2 kpc。基于X射线和$γ$射线发射之间的可能关联以及CO云和SNR之间的可能关联,我们认为扩展的TeV发射起源于SNR激波和相邻CO云之间的相互作用,而不是来自PWN。

英文摘要:

We present new results of the HESS J1731-347/SNR G353.6-0.7 system from XMM-NEWTOM and Suzaku X-ray observations, and Delinha CO observations. We discover extended hard X-rays coincident with the bright, extended TeV source HESS J1731-347 and the shell of the radio SNR. We find that spatially-resolved X-ray spectra can generally be characterized by an absorbed power-law model, with photon-index of ~ 2, typical of non-thermal emission. A bright X-ray compact source, XMMS J173203-344518, is also detected near the center of the SNR. We find no evidence of a radio counterpart or an extended X-ray morphology for this source, making it unlikely to be a pulsar wind nebular (PWN). The spectrum of the source can be well fitted by an absorbed blackbody with a temperature of ~ 0.5 keV plus a power-law tail with a photon-index of ~ 5, reminiscent of the X-ray emission of a magnetar. CO observations toward the inner part of the HESS source reveal a bright cloud component at -20+/-4 km s^{-1}, which is likely located at the same distance of ~ 3.2 kpc as the SNR. Based on the probable association between the X-ray and $γ$-ray emissions and likely association between the CO cloud and the SNR, we argue that the extended TeV emission originates from the interaction between the SNR shock and the adjacent CO clouds rather than from a PWN.

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