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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Published in | Publications of the Astronomical Society of Japan Vol. 68; no. SP1 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford University Press
01.06.2016
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0004-6264 0004-6264 2053-051X |
DOI: | 10.1093/pasj/psv114 |