中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
A POSSIBLE EXTENSION OF THE SCUTUM-CENTAURUS ARM INTO THE OUTER SECOND QUADRANT

文献类型:期刊论文

作者Xu, Y; Xu, Y; Zhou, X; Zhou, X; Yang, J; Yang, J
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2015
卷号798期号:2页码:L27
英文摘要The physical nature of thermal composite supernova remnants (SNRs) remains controversial. We have revisited the archival XMM-Newton and Chandra data of the thermal composite SNR Kesteven 41 (Kes 41 or G337.8-0.1) and performed a millimeter observation toward this source in the (CO)-C-12, (CO)-C-13, and (CO)-O-18 lines. The X-ray emission, mainly concentrated toward the southwestern part of the SNR, is characterized by distinct S and Ar He-like lines in the spectra. The X-ray spectra can be fitted with an absorbed nonequilibrium ionization collisional plasma model at a temperature of 1.3-2.6 keV and an ionization timescale of 0.1-1.2 x 10(12) cm(-3) s. The metal species S and Ar are overabundant, with 1.2-2.7 and 1.3-3.8 solar abundances, respectively, which strongly indicate the presence of a substantial ejecta component in the X-ray-emitting plasma of this SNR. Kes 41 is found to be associated with a giant molecular cloud (MC) at a systemic local standard of rest velocity of -50 km s(-1) and confined in a cavity delineated by a northern molecular shell, a western concave MC that features a discernible shell, and an Hi cloud seen toward the southeast of the SNR. The birth of the SNR in a preexisting molecular cavity implies a mass of greater than or similar to 18M(circle dot) for the progenitor if it was not in a binary system. Thermal conduction and cloudlet evaporation seem to be feasible mechanisms to interpret the X-ray thermal composite morphology, and the scenario of gas reheating by the shock reflected from the cavity wall is quantitatively consistent with the observations. An updated list of thermal composite SNRs is also presented in this paper.
学科主题天文和天体物理
收录类别SCI
语种英语
WOS记录号WOS:000347463300001
公开日期2015-12-24
源URL[http://libir.pmo.ac.cn/handle/332002/14906]  
专题紫金山天文台_紫金山天文台青海观测站
推荐引用方式
GB/T 7714
Xu, Y,Xu, Y,Zhou, X,et al. A POSSIBLE EXTENSION OF THE SCUTUM-CENTAURUS ARM INTO THE OUTER SECOND QUADRANT[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,798(2):L27.
APA Xu, Y,Xu, Y,Zhou, X,Zhou, X,Yang, J,&Yang, J.(2015).A POSSIBLE EXTENSION OF THE SCUTUM-CENTAURUS ARM INTO THE OUTER SECOND QUADRANT.ASTROPHYSICAL JOURNAL LETTERS,798(2),L27.
MLA Xu, Y,et al."A POSSIBLE EXTENSION OF THE SCUTUM-CENTAURUS ARM INTO THE OUTER SECOND QUADRANT".ASTROPHYSICAL JOURNAL LETTERS 798.2(2015):L27.

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来源:紫金山天文台

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