SIMBAD references

2018ApJ...854...87N - Astrophys. J., 854, 87-87 (2018/February-3)

Evidence for a neutral iron line generated by MeV protons from supernova remnants interacting with molecular clouds.

NOBUKAWA K.K., NOBUKAWA M., KOYAMA K., YAMAUCHI S., UCHIYAMA H., OKON H., TANAKA T., UCHIDA H. and TSURU T.G.

Abstract (from CDS):

Supernova remnants (SNRs) have been prime candidates for Galactic cosmic-ray accelerators. When low-energy cosmic-ray protons (LECRp) collide with interstellar gas, they ionize neutral iron atoms and emit the neutral iron line (Fe I Kα) at 6.40 keV. We search for the iron K-shell line in seven SNRs from the Suzaku archive data of the Galactic plane in the 6l≲40,|b|<1○^ region. All of these SNRs interact with molecular clouds. We discover Fe I Kα line emissions from five SNRs (W28, Kes 67, Kes 69, Kes 78, and W44). The spectra and morphologies suggest that the Fe I Kα line is produced by interactions between LECRp and the adjacent cold gas. The proton energy density is estimated to be >=10-100 eV cm–3, which is more than 10 times higher than that in the ambient interstellar medium.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmic rays - X-rays: ISM - ISM: supernova remnants

Simbad objects: 17

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2021.03.04-11:28:55

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