A Biconically expanding flow in W43A traced by SiO maser emission
文献类型：期刊论文
| 作者 | Imai, H; Nakashima, JI; Diamond, PJ; Miyazaki, A; Deguchi, S |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2005-04-01 |
| 卷号 | 622期号:2页码:L125-L128 |
| 关键词 | masers stars : AGB and post-AGB stars : mass loss stars : individual (W43A) stars : winds outflows |
| 英文摘要 | We report Very Long Baseline Array and Very Large Array observations of 22 GHz H2O and 43 GHz SiO (v = 1, J = 1-0) maser emission as well as 7 mm continuum emission in W43A, which exhibits a highly collimated jet of molecular gas and a spherically expanding envelope very similar to that of an OH/IR star. The spatiokinematical structure of the H2O masers is well fitted to a precessing jet model with an expansion velocity of 150 km s(-1) and a dynamical age of similar to 50 yr. The spatiokinematical structure of the SiO masers is well fitted to a biconically expanding flow model, whose axis is parallel to the direction of the collimated jet. Astrometry of the H2O and SiO masers suggests that these maser sources have a common dynamical center, possibly as part of a binary system, within 70 AU. The SiO masers may be excited on the surface of the cone that has significant deceleration and interacts with the jet. A 7 mm continuum emission source is located similar to 1300 AU away from these maser sources at a position angle of about -60 degrees from the jet axis. The physical relation of the continuum to the maser sources is still unclear. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | BIPOLAR ; STARS ; OUTFLOWS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000228093800013 |
| 源URL | [http://119.78.226.72/handle/331011/19439]  |
| 专题 | 上海天文台_VLBI研究室 |
| 作者单位 | 1.Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands 2.Kagoshima Univ, Fac Sci, Dept Phys, Kagoshima 8900065, Japan 3.Univ Illinois, Dept Astron, Urbana, IL 61801 USA 4.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England 5.Natl Astron Observ, Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan 6.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Imai, H,Nakashima, JI,Diamond, PJ,et al. A Biconically expanding flow in W43A traced by SiO maser emission[J]. ASTROPHYSICAL JOURNAL,2005,622(2):L125-L128. |
| APA | Imai, H,Nakashima, JI,Diamond, PJ,Miyazaki, A,&Deguchi, S.(2005).A Biconically expanding flow in W43A traced by SiO maser emission.ASTROPHYSICAL JOURNAL,622(2),L125-L128. |
| MLA | Imai, H,et al."A Biconically expanding flow in W43A traced by SiO maser emission".ASTROPHYSICAL JOURNAL 622.2(2005):L125-L128. |
入库方式： OAI收割
来源：上海天文台
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