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A water maser flare in W49N - The superposition of the spectra of two component masers
Zhou, JJ1,2; Zheng, XW1; Chen, YX1
2002-07-01
Source PublicationASTRONOMY & ASTROPHYSICS
Volume390Issue:1Pages:281-287
Contribution Rank2
Abstract

We report the results of our short time scale monitoring observations of W49N. Three water maser features were found to show obvious variations in flux density, line width and center velocity. Over a period of about 22 days, the -88.3, -56.9 and -12.8 km s(-1) features declined linearly in flux density at rates of 57, 113, 98.8 Jy per day, respectively. The line widths of the -56.9 and -12.8 km s(-1) features increased at rates of similar to0.022 and similar to0.046 km s(-1) per day, respectively, while the line width of the -88.3 km s(-1) feature increased at a rate of 0.01 km s(-1) per day during the first 17 days and decreased at a rate of 0.017 km s(-1) per day during the remainder of the days. All three features show a systematic shift of similar to1 km s(-1) in center velocity. We propose a model based on the superposition of the spectra of two maser clouds to explain the variations of these maser features: two rigidly rotating, unsaturated spherical maser clouds during the declining phase reach the same line-of-sight velocity, then they depart from each other because of their relative acceleration.

KeywordMasers Stars : Formation Ism : Individual Objects : W49n
SubtypeArticle
DOI10.1051/0004-6361:20020705
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordH2o Masers ; Time Variability ; Emission ; Regions
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000176980000033
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/859
Collection射电天文研究室_恒星形成与演化研究团组
射电天文研究室
Affiliation1.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
2.Chinese Acad Sci, Urumqi Astron Stn, Xinjiang 830011, Peoples R China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhou, JJ,Zheng, XW,Chen, YX. A water maser flare in W49N - The superposition of the spectra of two component masers[J]. ASTRONOMY & ASTROPHYSICS,2002,390(1):281-287.
APA Zhou, JJ,Zheng, XW,&Chen, YX.(2002).A water maser flare in W49N - The superposition of the spectra of two component masers.ASTRONOMY & ASTROPHYSICS,390(1),281-287.
MLA Zhou, JJ,et al."A water maser flare in W49N - The superposition of the spectra of two component masers".ASTRONOMY & ASTROPHYSICS 390.1(2002):281-287.
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