The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions
文献类型：期刊论文
| 作者 | Ouyang, Xu-Jia5; Chen, Xi4,5; Shen, Zhi-Qiang3,4; Yang, Kai2,4; Li, Xiao-Qiong2,4; Chen, Hon-Yin2,4; Zhao, Zhang5; Sobolev, Andrej M.1 |
| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 245期号:1页码:17 |
| ISSN号 | 0067-0049 |
| 关键词 | Astrophysical masers Interstellar medium H II regions Surveys Star formation Interstellar molecules |
| DOI | 10.3847/1538-4365/ab4db2 |
| 通讯作者 | Chen, Xi(chenxi@gzhu.edu.cn) |
| 英文摘要 | We report a systematic survey of a 6.7 GHz Class II methanol maser toward a sample of 448 sources selected from the Red Midcourse Space Experiment Source catalog. These sample sources are composed of high-mass star-forming region (HMSFR) candidates and have been studied as tracers of HMSFRs, such as water masers or radio continuum emission of ultracompact H ii region. The survey was conducted using the Shanghai Tianma Radio Telescope. Through the observations, we simultaneously studied the 4.7 and 6.0 GHz excited-state interstellar hydroxyl (OH) maser lines and 10 hydrogen radio recombination lines (RRLs) in the C band. In total, we detected 6.7 GHz methanol masers and RRLs from 102 and 116 sources, respectively. In addition, 4, 3, and 10 sources exhibit OH masers at 4765.56, 6030.75, and 6035.09 MHz transitions, respectively. Through the survey, we identified four new 6.7 GHz methanol maser sources and three new excited-state OH maser sources (one at 4750 MHz and two at 6035 MHz). The statistical analysis demonstrated that there is a positive correlation of luminosity between 6.7 GHz methanol masers and RRLs. A good correlation of integrated luminosity between radio continuum emission and the 6.7 GHz methanol masers is presented with respect to the RRL emission sources. The average of the integrated luminosities of the RRLs in the sources with 6.7 GHz masers is greater than those without the 6.7 GHz masers; similarly, the average of integrated luminosities of the 6.7 GHz methanol masers in the sources with RRLs is greater than those without the RRLs. Moreover, we found that the averages of the emission measure and electron temperature of H ii regions associated with 6.7 GHz methanol masers are larger than those without the 6.7 GHz methanol masers. This suggests that the masers are most likely produced in high gas density and luminous regions with brighter RRLs and higher radio continuum emission. |
| WOS关键词 | INTERSTELLAR HYDROXYL MASERS ; COMPACT HII-REGIONS ; PLANE SURVEY HOPS ; H II REGIONS ; GALACTIC PLANE ; TRIGONOMETRIC PARALLAXES ; H2O MASERS ; CATALOG ; OH ; SEARCH |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000499826200001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35180]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Chen, Xi |
| 作者单位 | 1.Ural Fed Univ, 19 Mira St, Ekaterinburg 620002, Russia 2.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China 4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 5.Guangzhou Univ, Ctr Asrophys, Guangzhou 510006, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ouyang, Xu-Jia,Chen, Xi,Shen, Zhi-Qiang,et al. The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2019,245(1):17. |
| APA | Ouyang, Xu-Jia.,Chen, Xi.,Shen, Zhi-Qiang.,Yang, Kai.,Li, Xiao-Qiong.,...&Sobolev, Andrej M..(2019).The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,245(1),17. |
| MLA | Ouyang, Xu-Jia,et al."The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 245.1(2019):17. |
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来源：紫金山天文台
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