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Suzaku study on the ejecta of the supernova remnant G272.2−3.2

We report reanalyses of the Suzaku observations of the Galactic supernova remnant (SNR) G272.2−3.2, for which previous studies were limited below 3 keV. With careful data reduction and background subtraction, we discover the K-shell lines of Ar, Ca, and Fe above 3 keV. The X-ray spectrum of G272.2−3...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Japan 2016-06, Vol.68 (SP1)
Main Authors: Kamitsukasa, Fumiyoshi, Koyama, Katsuji, Nakajima, Hiroshi, Hayashida, Kiyoshi, Mori, Koji, Katsuda, Satoru, Uchida, Hiroyuki, Tsunemi, Hiroshi
Format: Article
Language:English
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Summary:We report reanalyses of the Suzaku observations of the Galactic supernova remnant (SNR) G272.2−3.2, for which previous studies were limited below 3 keV. With careful data reduction and background subtraction, we discover the K-shell lines of Ar, Ca, and Fe above 3 keV. The X-ray spectrum of G272.2−3.2 consists of two components, a low-temperature collisional ionization equilibrium (CIE) plasma (kT e ∼ 0.2 keV) and a high-temperature non-equilibrium ionization (NEI) plasma (kT e = 0.6–3 keV). The CIE plasma has solar abundances over the entire area, hence it originates from the interstellar medium. On the other hand, the abundances of the NEI plasma increase toward the inner region, suggesting ejecta origin. The line center energy of the Fe K-shell emission (∼6.4 keV) suggests that the ejecta are recently heated by reverse shock, a common feature in Type Ia SNRs.
ISSN:0004-6264
0004-6264
2053-051X
DOI:10.1093/pasj/psv114