Ionized gas clouds near the Sagittarius Arm tangent
文献类型：期刊论文
| 作者 | Hou, Li-Gang1 ; Dong, Jian2; Gao, Xu-Yang1; Han, Jin-Lin1
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 17期号:5 |
| 关键词 | Galaxy: disk radio lines: ISM ISM: HII regions |
| 英文摘要 | Radio recombination lines (RRLs) are the best tracers of ionized gas. Simultaneous observations of multi-transitions of RRLs can significantly improve survey sensitivity. We conducted pilot RRL observations near the Sagittarius Arm tangent by using the 65-m Shanghai Tian Ma Radio Telescope (TMRT) equipped with broadband feeds and a digital backend. Six hydrogen RRLs (H96 alpha-H101 alpha) at C band (6289MHz-7319MHz) were observed simultaneously toward a sky area of 2. x 1.2. by using on-the-fly mapping mode. These transitions were then stacked together for detection of ionized gas. Star forming complexes G48.6+0.1 and G49.5-0.3 were detected in the integrated intensity map. We found agreements between our measured centroid velocities and previous results for the 21 known HII regions in the mapped area. For more than 80 cataloged HII region candidates without previous RRL measurements, we obtained new RRL spectra at 30 targeted positions. In addition, we detected 25 new discrete RRL sources with spectral S/N > 5 sigma, and they were not listed in the catalogs of previously known HII regions. The distances for 44 out of these 55 new RRL sources were estimated. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | H-II REGIONS ; RADIO RECOMBINATION LINES ; GALACTIC PLANE SURVEY ; STAR-FORMATION REGIONS ; MILKY-WAY ; SPIRAL STRUCTURE ; TRIGONOMETRIC PARALLAXES ; DISTANCE AMBIGUITIES ; SPATIAL-DISTRIBUTION ; H166-ALPHA EMISSION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000405574100008 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8861]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hou, Li-Gang,Dong, Jian,Gao, Xu-Yang,et al. Ionized gas clouds near the Sagittarius Arm tangent[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(5). |
| APA | Hou, Li-Gang,Dong, Jian,Gao, Xu-Yang,&Han, Jin-Lin.(2017).Ionized gas clouds near the Sagittarius Arm tangent.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(5). |
| MLA | Hou, Li-Gang,et al."Ionized gas clouds near the Sagittarius Arm tangent".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.5(2017). |
入库方式： OAI收割
来源：国家天文台
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