| Number | R3-3 |
| Date&Time | 15:30-17:00,Wednesday, October 13, 2021 |
| Place | Zoom Conference: https://u-tokyo-ac-jp.zoom.us/j/81302700351?pwd=TkdsZnRRVWo5OUZRWVpVZjB2aGtrUT09 |
| Speaker | Yasuo Fukui (Department of Physics, Nagoya University) |
| Title | “Quantification of the hadronic and leptonic gamma-ray components in the TeV gamma ray supernova remnant RX J1713.7−3946” |
| Abstract | Supernova remnants (SNRs) have been thought as a promising site for cosmic ray acceleration in the Milky Way. It was however difficult to disentangle the gamma ray emitting processes, leaving the cosmic ray origin unsettled. We developed a new methodology which assumes that the gamma-ray counts Ng is expressed by a linear combination of two terms; one is proportional to the interstellar proton column density Np and the other proportional to the nonthermal X-ray count Nx. We interpret that the former corresponds to the hadronic component and the latter the leptonic component. We applied the scheme to the core collapse SNR RX J1713.7−3946 and derived the ratio between the hadronic and leptonic component to be ~70%:30%. This has quantified the two gamma ray origins for the first time. The dominance of the hadronic gamma rays reflects the massive interstellar protons of ∼ 10^4M⊙, target protons in the p-p reaction, associated with the SNR, lending further support for the acceleration of the cosmic-ray protons. Reference Y. Fukui, H. Sano, Y. Yamane, T. Hayakawa, T. Inoue, K. Tachihara, G. Rowell, and S. Einecke 2021, ApJ, 915, 84F Presentation File |
