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Title:
Discovery of a Featureless X-Ray Spectrum in the Supernova Remnant Shell of G330.2+1.0
Authors:
Torii, Ken'ichi; Uchida, Hiroyuki; Hasuike, Kazuto; Tsunemi, Hiroshi; Yamaguchi, Yasuhiro; Shibata, Shinpei
Affiliation:
AA(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043) AB(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043) AC(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043) AD(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043) AE(Department of Physics, Yamagata University, Kojirakawa, Yamagata, Yamagata 990-8560) AF(Department of Physics, Yamagata University, Kojirakawa, Yamagata, Yamagata 990-8560)
Publication:
Publications of the Astronomical Society of Japan, Vol.58, No.1, pp. L11-L14 (PASJ Homepage)
Publication Date:
02/2006
Origin:
PASJ
Keywords:
acceleration of particles, ISM: supernova remnants, X-rays: individual (G330.2+1.0)
Bibliographic Code:
2006PASJ...58L..11T

Abstract

We report here on the first pointed X-ray observation of the supernova remnant (SNR) G330.2+1.0. The X-ray morphology is characterized by an extended shell. Its X-ray spectrum is well represented by a single power-law function with a photon index of γ ≃ 2.8 and interstellar absorption of nH ≃ 2.6 × 1022 [cm-2]. We interpret this emission as synchrotron radiation from accelerated electrons at the SNR shock, as seen in SN 1006. The surface brightness of the X-ray emission is anti-correlated with the radio emission, and the power-law spectrum is dominated at the western shell where the radio emission is weak. The co-existence of two distinct (radio bright/X-ray faint and radio faint/X-ray bright) shells in a single supernova remnant challenges our understanding of the particle acceleration and radiation mechanisms in different interstellar environments. The object may be a good target for searching TeV gamma-rays and molecular gas surrounding the blast shock. We also report on the nature of a bright point-like source (AX J1601‑5143) to the south of the SNR.
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