ASCA Observations of the Supernova Remnant G156.2+5.7

Publications of the Astronomical Society of Japan

Tamura, Keisuke³  Yamauchi, Shigeo²  Koyama, Katsuji¹  Tomida, Hiroshi¹  Yokogawa, Jun¹ 

[1] Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502;Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020-8550;Department of Astrophysics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602

关键词: "ISM: individual objects(G1562+57)";    Supernovae;    "Supernova remnants";    "X-rays: sources";    "X-rays: spectra";   

DOI  :  10.1093/pasj/51.1.13

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WereportontheASCAX-rayspectrafromthenorthrimandthecenterofthesupernovaremnant(SNR)G156.2+5.7.ThespectraarefoundtocomprisesoftandhardX-raycomponents.Noclearshellstructurehasbeenfound,eitherinthesoftorinthehardX-raybands.ThesoftX-raysareattributabletoanon-equilibriumionizationplasmawithatemperatureof0.4keVandanionizationtimescaleof1011.0−11.2cm−3s.ASedovsolutionwithanexplosionenergyof1051ergleadstoanageof∼1.5×104yrandadensityofambientgasof∼0.2cm−3.ThedistancetoG156.2+5.7isestimatedtobe∼1.3kpc.TheabundancesofsiliconandsulfurvarybetweenthecenterandthenorthrimoftheSNR,whiletheabundancesofallotherelementsdonot.ThehardcomponentcanbemodeledwitheitherthermalemissionofatemperaturehigherthanafewkeVoranon-thermalprocesswithapower-lawspectrumofphotonindex1.5–1.8.Sincetheformermodelrequiresanuncomfortablyhightemperature,wefavoranon-thermalmodel.WealsodiscussthenatureofapointsourcefoundattheedgeoftheSNR.

【 授权许可】

Unknown