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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: Astrophysical Journal, 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.
RMID: 0030078618
DOI: 10.3847/1538-4357/aa9219
Appears in Collections:Chemistry and Physics publications

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