中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 分子云与恒星形成研究团组  > 期刊论文
题名: SiS in the Circumstellar Envelope of IRC+10216: Maser and Quasi-thermal Emission
作者: Gong, Y.; Henkel, C.; Ott, J.; Menten, K. M.; Morris, M. R.; Keller, D.; Claussen, M. J.; Grasshoff, M.; Mao, R. Q.
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 843, 期号:1, 页码:54-
英文摘要: We present new Effelsberg 100-m, Australia Telescope Compact Array (ATCA), and Very Large Array observations of rotational SiS transitions in the circumstellar envelope (CSE) of IRC +10216. Thanks to the high angular resolution achieved by the ATCA observations, we unambiguously confirm that the molecule's J= 1 (R) 0 transition exhibits maser action in this CSE, as first suggested more than 30 years ago. The maser emission's radial velocity, peaking at a local standard of rest velocity of -39.862 +/- 0.065 km s-1, indicates that it arises from an almost fully accelerated shell. Monitoring observations show time variability of the SiS (1 (R) 0) maser. The two lowest-J SiS quasi-thermal emission lines trace a much more extended emitting region than previous high-J SiS observations. Their distributions show that the SiS quasi-thermal emission consists of two components: one is very compact (radius < 1."5, corresponding to <3 x 10(15) cm), and the other extends out to a radius >11''. An incomplete shell-like structure is found in the northeast, which is indicative of existing SiS shells. Clumpy structures are also revealed in this CSE. The gain of the SiS (1 (R) 0) maser (optical depths of about -5 at the blueshifted side and, assuming inversion throughout the entire line's velocity range, about -2 at the redshifted side) suggests that it is unsaturated. The SiS (1 (R) 0) maser can be explained in terms of ro-vibrational excitation caused by infrared pumping, and we propose that infrared continuum emission is the main pumping source.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17377
Appears in Collections:分子云与恒星形成研究团组_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2017148.pdf(3604KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Gong, Y.]'s Articles
[Henkel, C.]'s Articles
[Ott, J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Gong, Y.]‘s Articles
[Henkel, C.]‘s Articles
[Ott, J.]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 2017148.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院紫金山天文台 - Feedback
Powered by CSpace