Neutral iron line in the supernova remnant IC?443 and implications for MeV cosmic rays
Neutral iron line in the supernova remnant IC?443 and implications for MeV cosmic rays
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超新星遗迹 IC?443 中的中性铁线及其对 MeV 宇宙射线的影响
DOI：
10.1093/pasj/psz099
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发表时间：
2019
影响因子：
2.3
通讯作者：
Yamauchi Shigeo
中科院分区：
文献类型：
--
作者：
Nobukawa Kumiko K;Hirayama Arisa;Shimaguchi Aika;Fujita Yutaka;Nobukawa Masayoshi;Yamauchi Shigeo
我们报告了在超新星遗迹（SNR）IC 443的西北部和中部发现了明亮的斑点状FeiKline增强。谱线辐射的分布与分子云与激波阵面的相互作用有关，与等离子体的分布完全不同。FeiKline具有大的等效宽度。对于谱线发射的起源，最合理的解释是MeV的质子在壳层中加速泄漏到分子云中，并电离了其中的Fe原子。所观察到的FeiKline强度与理论模型的预测一致，其中MeV质子在SNR下与GeV和TeV质子一起沿着加速。
We report a discovery of bright blob-like enhancements of an FeiKline in the northwest and the middle of the supernova remnant (SNR) IC 443. The distribution of the line emission is associated with molecular clouds interacting with the shock front, and is totally different from that of the plasma. The FeiKline has a large equivalent width. The most plausible scenario for the origin of the line emission is that the MeV protons accelerated in the shell leak into the molecular clouds and ionized the Fe atoms therein. The observed FeiKline intensity is consistent with the prediction of a theoretical model in which MeV protons are accelerated along with GeV and TeV protons at the SNR.