High-velocity gas associated ultracompact HII regions
文献类型：期刊论文
| 作者 | Xu, Y ; Jiang, DR; Yang, CY; Zheng, XW; Gu, MF; Pei, CC
|
| 刊名 | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY
 |
| 出版日期 | 2002-07-01 |
| 卷号 | 45期号:7页码:937-945 |
| 关键词 | HII regions ISM : jets and outflows stars : formation masers |
| 英文摘要 | We present the results of a survey for high-velocity (CO)-C-12 (1-0) emission associated H2O masers and ultracompact (UC) Hll regions. The aim is to investigate the relationship between H2O masers, CO high-velocity gas (HVG) and their associated infrared sources. Our sample satisfies Wood & Churchwell criterion. Almost 70% of the sources have full widths (FWs) greater than 15 km . s(-1) at T-a = 100 mK and 15% have FWs greater than 30 km . s(-1). In most of our objects there is excess high velocity emission in the beam. There is a clear correlation between CO line FWs and far-infrared luminosities: the FW increases with the FIR luminosity. The relation suggests that more luminous sources are likely to be more energetic and able to inject more energy into their surroundings. As a result, larger FW of the CO line could be produced. In most of our sources, the velocities of peak of the H2O emission are in agreement with those of the CO cloud, but a number of them have a large blueshift with respect to the CO peak. These masers might stem from the amplifications of a background source, which may amplify some unobservable weak masers to an observable level. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Mathematics, Applied ; Mathematics |
| 研究领域[WOS] | Mathematics |
| 关键词[WOS] | H2O MASER SOURCES ; H-II-REGIONS ; IRAS SOURCES ; WATER MASERS ; SOLAR CIRCLE ; MOLECULAR OUTFLOWS ; STAR-FORMATION ; MASSIVE STARS ; EMISSION ; CLOUD |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000176851400014 |
| 公开日期 | 2013-01-29 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/7797]  |
| 专题 | 紫金山天文台_紫金山天文台青海观测站 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Columbia Univ, Dept Astron, New York, NY 10027 USA 4.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 5.Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Y,Jiang, DR,Yang, CY,et al. High-velocity gas associated ultracompact HII regions[J]. SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,2002,45(7):937-945. |
| APA | Xu, Y,Jiang, DR,Yang, CY,Zheng, XW,Gu, MF,&Pei, CC.(2002).High-velocity gas associated ultracompact HII regions.SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,45(7),937-945. |
| MLA | Xu, Y,et al."High-velocity gas associated ultracompact HII regions".SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY 45.7(2002):937-945. |
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来源：紫金山天文台
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