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arXiv · 1901.10477

Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons Escaped from Supernova Remnants

Ken Makino·Yutaka Fujita·Kumiko Nobukawa·Hironori Matsumoto·Yutaka Ohira
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Abstract

Recent discovery of the X-ray neutral iron line (Fe I Kαat 6.40 keV) around several supernova remnants (SNRs) show that MeV cosmic-ray (CR) protons are distributed around the SNRs and are interacting with neutral gas there. We propose that these MeV CRs are the ones that have been accelerated at the SNRs together with GeV-TeV CRs. In our analytical model, the MeV CRs are still confined in the SNR when the SNR collides with molecular clouds. After the collision, the MeV CRs leak into the clouds and produce the neutral iron line emissions. On the other hand, GeV-TeV CRs had already escaped from the SNRs and emit gamma-rays through interaction with molecular clouds surrounding the SNRs. We apply this model to the SNRs W28 and W44 and show that it can reproduce the observations of the iron line intensities and the gamma-ray spectra. This can be another support of a hadronic scenario for the gamma-ray emissions from these SNRs.

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Ken Makino, Yutaka Fujita, Kumiko Nobukawa, Hironori Matsumoto, Yutaka Ohira. 2019-08-23. Interaction between Molecular Clouds and MeV-TeV Cosmic-ray Protons Escaped from Supernova Remnants. https://doi.org/10.1093/pasj%2Fpsz058

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