An analysis of neutral interstellar gas in the γ-ray middle-aged supernova remnants (SNRs) is presented. We carried out multi-line CO observations of 12CO(J = 1–0) and 12CO(J = 2–1) toward three middle-aged SNRs, W44, IC 443 and W28, with the NANTEN2 telescope. For all three SNRs, we identified the shocked molecular gas which has high-velocity wing emission and the high 12CO J = 2–1/1–0 line intensity ratio of greater than 1. The distribution of these shocked gas has the good correlation with that of GeV–TeV γ-rays, which indicates these γ-rays originate from hadronic process and the interaction between SNR shock and clouds plays an major role in the cosmic-ray acceleration for these SNRs. By combining CO results with archive H I data, we derived the amount of total interstellar protons responsible for the γ-rays. Every SNRs have the averaged proton densities ranged from a few hundred to less than 103 cm−3 and we estimated the total cosmic-ray proton energy to be ∼ 1048–1049 erg as lower limits.
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4 January 2017
HIGH ENERGY GAMMA-RAY ASTRONOMY: 6th International Meeting on High Energy Gamma-Ray Astronomy
11–15 July 2016
Heidelberg, Germany
Research Article|
January 04 2017
Interstellar gas in the middle-aged SNRs
Satoshi Yoshiike;
Satoshi Yoshiike
a)
1Department of Physics,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
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Tatsuya Fukuda;
Tatsuya Fukuda
1Department of Physics,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
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Hidetoshi Sano;
Hidetoshi Sano
1Department of Physics,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
2Institute for Advanced Research,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
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Yasuo Fukui
Yasuo Fukui
1Department of Physics,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
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Satoshi Yoshiike
1,a)
Tatsuya Fukuda
1
Hidetoshi Sano
1,2
Yasuo Fukui
1
1Department of Physics,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
2Institute for Advanced Research,
Nagoya University
, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
a)
Corresponding author: [email protected]
AIP Conf. Proc. 1792, 040039 (2017)
Citation
Satoshi Yoshiike, Tatsuya Fukuda, Hidetoshi Sano, Yasuo Fukui; Interstellar gas in the middle-aged SNRs. AIP Conf. Proc. 4 January 2017; 1792 (1): 040039. https://doi.org/10.1063/1.4968943
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