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A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence

唐唐添加于 2011-7-29 05:34 | 1697 次阅读 | 0 个评论

作者
Fukui Y, Sano H, Sato J, Horachi H, Hayakawa T, Torii K, McClure-Griffiths NM, Rowell G, Inoue T, Inutsuka S, Kawamura A, Yamamoto H, Okuda T, Mizuno N, Onishi T, Mizuno A, Ogawa H
摘要
RX J1713.7-3946 is the most remarkable TeV {\gamma}-ray SNR which emits {\gamma}-rays in the highest energy range 10-100 TeV. We made a combined analysis of CO and HI in the SNR and derived the total ISM protons. The distribution of the protons shows a good morphological correlation with the shell-like {\gamma}-ray distribution, where the southeastern rim of the {\gamma}-ray shell has a counterpart only in the atomic protons. This finding shows that the ISM proton distribution is consistent with the hadronic scenario that CR protons react with ISM protons leading to the {\gamma}-rays production. This provides another step forward for the hadronic origin of the {\gamma}-rays by offering one of the necessary conditions missing in the previous hadronic interpretations. We argue that the highly inhomogeneous distribution of the ISM protons is crucial in the origin of the {\gamma} and X-rays. Most of the neutral gas was likely swept up by the stellar wind of an OB star prior to the supernova explosion to form a low-density cavity and a swept-up high-density wall. The cavity explains the low-density site where the diffusive shock acceleration of particles takes place. In addition, the low density suppresses the thermal X-rays, whereas the CR protons can reach the target protons in the dense wall to produce the {\gamma}-rays via the hadronic process. The present finding allows us to estimate the total CR proton energy to be ~10$^{48}$ ergs, 0.1% of the total energy of a SNe.
详细资料
- 文献种类: Journal Article
- 备注:arXiv:1107.0508v2; 47 pages, 13 figures, 1 tables, to submitted in The Astrophysical Journal. The appendix figures are available at http://www.a.phys.nagoya-u.ac.jp/~fukui/fukui+2011_rxj1713/
学科领域自然科学 » 天文学
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