Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations
文献类型：期刊论文
| 作者 | Fujisawa, Kenta1,2; Sugiyama, Koichiro2; Motogi, Kazuhito2; Hachisuka, Kazuya3; Yonekura, Yoshinori4; Sawada-Satoh, Satoko5; Matsumoto, Naoko6; Sorai, Kazuo7; Momose, Munetake8; Saito, Yu8 |
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
 |
| 出版日期 | 2014-04-01 |
| 卷号 | 66期号:2页码:31 |
| 关键词 | H II regions instrumentation: high angular resolution masers stars: formation |
| 英文摘要 | Very-long-baseline interferometry (VLBI) monitoring of the 6.7 GHz methanol maser allows us to measure the internal proper motion of maser spots and therefore study the gas motion around high-mass young stellar objects. To this end, we have begun monitoring observations with the East-Asian VLBI Network. In this paper we present the results of the first epoch observation for 36 sources, including 35 VLBI images of the methanol maser. Since two independent sources were found in three images, images of 38 sources were obtained. In 34 sources, 10 or more spots were detected. The observed spatial scale of the maser distribution was from 9 to 4900 astronomical units, and the following morphological categories were observed: elliptical, arched, linear, paired, and complex. The position of the maser spot was determined with an accuracy of approximately 0.1 mas, which is sufficiently high to measure the internal proper motion from two years of monitoring observations. The VLBI observation, however, detected only approximately 20% of all maser emissions, suggesting that the remaining 80% of the total flux was spread into an undetectable extended distribution. Therefore, in addition to high-resolution observations, it is important to observe the whole structure of the maser emission including extended low-brightness structures, in order to reveal the associated site of the maser and gas motion. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR-FORMING REGIONS ; H-II REGIONS ; ULTRACOMPACT HII-REGIONS ; YOUNG STELLAR OBJECTS ; INFRARED DARK CLOUDS ; 3 KPC ARM ; TRIGONOMETRIC PARALLAXES ; HIGH-RESOLUTION ; OUTFLOW SIGNATURES ; CIRCUMSTELLAR DISC |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339427200016 |
| 源URL | [http://119.78.226.72/handle/331011/16250]  |
| 专题 | 上海天文台_VLBI研究室 |
| 作者单位 | 1.Yamaguchi Univ, Res Inst Time Studies, Yamaguchi 7538511, Japan 2.Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi 7538511, Japan 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Ibaraki Univ, Ctr Astron, Mito, Ibaraki 3108512, Japan 5.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mizusawa Ku, Oshu, Iwate 0230861, Japan 6.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan 7.Hokkaido Univ, Dept Cosmosci, Dept Phys, Kita Ku, Sapporo, Hokkaido 0600810, Japan 8.Ibaraki Univ, Coll Sci, Mito, Ibaraki 3108512, Japan 9.Gifu Univ, Fac Engn, Gifu 5011193, Japan 10.Osaka Prefecture Univ, Dept Phys Sci, Naka Ku, Sakai, Osaka 5998531, Japan |
| 推荐引用方式 GB/T 7714 | Fujisawa, Kenta,Sugiyama, Koichiro,Motogi, Kazuhito,et al. Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2014,66(2):31. |
| APA | Fujisawa, Kenta.,Sugiyama, Koichiro.,Motogi, Kazuhito.,Hachisuka, Kazuya.,Yonekura, Yoshinori.,...&Kim, Kee-Tae.(2014).Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,66(2),31. |
| MLA | Fujisawa, Kenta,et al."Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 66.2(2014):31. |
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来源：上海天文台
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