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Title:
Observation of Kes 27: A Typical Mixed-Morphology SNR
Authors:
Enoguchi, Hideyuki; Tsunemi, Hiroshi; Miyata, Emi; Yoshita, Kumi
Affiliation:
AA(Dept of Earth and Space Science, Graduate School of Science, Osaka University), AB(Dept of Earth and Space Science, Graduate School of Science, Osaka University), AC(Dept of Earth and Space Science, Graduate School of Science, Osaka University), AD(Dept of Earth and Space Science, Graduate School of Science, Osaka University)
Publication:
Publications of the Astronomical Society of Japan, Vol.54, No.2, pp.229-234 (PASJ Homepage)
Publication Date:
04/2002
Origin:
PASJ
Keywords:
ISM: abundances, ISM: individual (Kes27), supernova remnants, X-rays: ISM
Bibliographic Code:
2002PASJ...54..229E

Abstract

We report here on the observation of Kes27, a proto-typical mixed-morphology SNR, using ASCA. It clearly shows a filled-center structure in the X-ray region while a shell structure in the radio region. There are two radio bright regions: one is in the center, while the other is in the east rim. The X-ray intensity peak coincides well with the radio bright region at the center. The X-ray spectrum was well-fitted by a collisional ionization equilibrium model with the solar abundances. Taking into account the ionization parameter (>1012 cm-3 s) and the plasma density (0.39+0.03-0.02 cm-3), we found that the age of the SNR is longer than 8 × 104 yr. The hardness ratio map indicates that the inner region shows a harder spectrum than that in the outer region, which does not come from the heavier interstellar absorption feature, but from the higher temperature. There is a temperature gradient from the innn er region (0.84 +/- 0.08 keV) toward the outer region 0.59+0.04-0.06 keV), indicating that the thermal conduction does not play an important role.
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