A water maser flare in W49N - The superposition of the spectra of two component masers
文献类型：期刊论文
| 作者 | Zhou, JJ1,2 ; Zheng, XW1; Chen, YX1
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2002-07-01 |
| 卷号 | 390期号:1页码:281-287 |
| 关键词 | masers stars : formation ISM : individual objects : W49N |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | H2O MASERS ; TIME VARIABILITY ; EMISSION ; REGIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000176980000033 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/859]  |
| 专题 | 恒星形成与演化研究团组 新疆天文台_射电天文研究室 |
| 作者单位 | 1.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, Urumqi Astron Stn, Xinjiang 830011, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：新疆天文台
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