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arXiv 1107.3470astro-ph.HE
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SNR G35周围的宇宙射线。6 -0.4

Cosmic rays in the surroundings of SNR G35.6-0.4

Diego F. Torres, Hui Li, Yang Chen, Analia Cillis, Andrea G. Caliandro, Ana Y. Rodriguez-Marrero

摘要:

HESS J1858+020是一个TeV伽马射线源,据报道在任何波长都没有任何清晰的编目对应物。然而,最近有人提出,这个源是间接与无线电源,重新确定为超新星遗迹(SNR),G35.6-0.4。后者被发现是中年($\sim 30$ kyr)和附近的分子云(MC)。HESS J1858+020被认为是SNR壳层中加速的质子与云中的靶离子相互作用的结果。费米大天区望远镜(LAT)的第一个源表中没有列出任何与HESS J1858+020位置一致的源,但有些离它很近。在这里,我们分析了2年多来用费米LAT获得的感兴趣区域的数据,并考虑是否确实可能最近的LAT源1FGL J1857.1+ 0212 c与HESS J1858+020有关。我们的结论是,它不是,我们施加上限的GeV的排放源自HESS J1858+020。利用一个简化的3D模型,我们考虑了SNR G35.6-0.4和附近MCs之间的相互作用是否会引起HESS J1858+020的TeV辐射而不产生GeV对应物。如果是这样的话,这对没有GeV探测的SNR/TeV源将让人想起其他类似年龄的SNR,例如W28附近的一些TeV热点,宇宙射线扩散可以用来解释它们的多频现象。然而,对于HESS J1858+020,我们发现,尽管相空间原则上允许出现这种GeV-TeV非相关性,但通常和/或观测上受约束的参数值(例如,扩散系数和云-SNR可能的距离)将不利于它。

英文摘要:

HESS J1858+020 is a TeV gamma-ray source that was reported not to have any clear cataloged counterpart at any wavelength. However, it has been recently proposed that this source is indirectly associated with the radio source, re-identified as a supernova remnant (SNR), G35.6-0.4. The latter is found to be middle-aged ($\sim 30$ kyr) and to have nearby molecular clouds (MCs). HESS J1858+020 was proposed to be the result of the interaction of protons accelerated in the SNR shell with target ions residing in the clouds. The Fermi Large Area Telescope (LAT) First Source Catalog does not list any source coincident with the position of HESS J1858+020, but some lie close. Here, we analyse more than 2 years of data obtained with the Fermi-LAT for the region of interest, and consider whether it is indeed possible that the closest LAT source, 1FGL J1857.1+0212c, is related to HESS J1858+020. We conclude it is not, and we impose upper limits on the GeV emission originating from HESS J1858+020. Using a simplified 3D model for the cosmic-ray propagation out from the shell of the SNR, we consider whether the interaction between SNR G35.6-0.4 and the MCs nearby could give rise to the TeV emission of HESS J1858+020 without producing a GeV counterpart. If so, the pair of SNR/TeV source with no GeV detection would be reminiscent of other similarly-aged SNRs, such as some of the TeV hotspots near W28, for which cosmic-ray diffusion may be used to explain their multi-frequency phenomenology. However, for HESS J1858+020, we found that although the phase space in principle allows for such GeV--TeV non-correlation to appear, usual and/or observationally constrained values of the parameters (e.g., diffusion coefficients and cloud-SNR likely distances) would disfavor it.

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