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https://hdl.handle.net/2440/112350
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Type: | Journal article |
Title: | A detailed study of the interstellar protons toward the TeV γ-Ray SNR RX J0852.0-4622 (G266.2-1.2, Vela Jr.): the third case of the γ-Ray and ISM spatial correspondence |
Author: | Fukui, Y. Sano, H. Sato, J. Okamoto, R. Fukuda, T. Yoshiike, S. Hayashi, K. Torii, K. Hayakawa, T. Rowell, G. Filipović, M. Maxted, N. Mcclure-Griffiths, N. Kawamura, A. Yamamoto, H. Okuda, T. Mizuno, N. Tachihara, K. Onishi, T. Mizuno, A. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2017; 850(1):71-1-71-19 |
Publisher: | IOP Publishing |
Issue Date: | 2017 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | Y. Fukui, H. Sano, J. Sato, R. Okamoto, T. Fukuda ... Gavin P. Rowell ... et al. |
Abstract: | We present a new analysis of the interstellar protons toward the TeV γ-ray SNR RX J0852.0−4622 (G266.2−1.2, Vela Jr.). We used the NANTEN2 12CO(J = 1–0) and Australia Telescope Compact Array and Parkes H i data sets in order to derive the molecular and atomic gas associated with the TeV γ-ray shell of the SNR. We find that atomic gas over a velocity range from V LSR = −4 to 50 km s−1 or 60 km s−1 is associated with the entire SNR, while molecular gas is associated with a limited portion of the SNR. The large velocity dispersion of the H i is ascribed to the expanding motion of a few H i shells overlapping toward the SNR but is not due to the Galactic rotation. The total masses of the associated H i and molecular gases are estimated to be $\sim 2.5\times {10}^{4}$ M ⊙ and ~103 M ⊙, respectively. A comparison with the High Energy Stereoscopic System TeV γ-rays indicates that the interstellar protons have an average density around 100 cm−3 and shows a good spatial correspondence with the TeV γ-rays. The total cosmic-ray proton energy is estimated to be ~1048 erg for the hadronic γ-ray production, which may still be an underestimate by a factor of a few due to a small filling factor of the SNR volume by the interstellar protons. This result presents a third case, after RX J1713.7−3946 and HESS J1731−347, of the good spatial correspondence between the TeV γ-rays and the interstellar protons, lending further support for a hadronic component in the γ-rays from young TeV γ-ray SNRs. |
Keywords: | Cosmic rays-gamma rays: ISM-ISM: clouds-ISM: individual objects (RX J0852.0-4622)-ISM: supernova remnants |
Rights: | © 2017. The American Astronomical Society. All rights reserved. |
DOI: | 10.3847/1538-4357/aa9219 |
Published version: | http://dx.doi.org/10.3847/1538-4357/aa9219 |
Appears in Collections: | Aurora harvest 8 Chemistry and Physics publications |
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