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Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. I. VLBI images of the first epoch of observations
Fujisawa, Kenta1,2; Sugiyama, Koichiro2; Motogi, Kazuhito2; Hachisuka, Kazuya3; Yonekura, Yoshinori4; Sawada-Satoh, Satoko5; Matsumoto, Naoko6; Sorai, Kazuo7; Momose, Munetake8; Saito, Yu8; Takaba, Hiroshi9; Ogawa, Hideo10; Kimura, Kimihiro10; Niinuma, Kotaro2; Hirano, Daiki2; Omodaka, Toshihiro11; Kobayashi, Hideyuki6; Kawaguchi, Noriyuki6; Shibata, Katsunori M.6; Honma, Mareki6; Hirota, Tomoya6; Murata, Yasuhiro12,13; Doi, Akihiro12,13; Mochizuki, Nanako12; Shen, Zhiqiang3,14; Chen, Xi3,14; Xia, Bo3,14; Li, Bin3,14; Kim, Kee-Tae15
2014-04-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume66Issue:2
AbstractVery-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.
Keywordh Ii Regions Instrumentation: High Angular Resolution Masers Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/pasj/psu015
WOS KeywordSTAR-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
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000339427200016
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15594
Collection盱眙天文观测站
Affiliation1.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
11.Kagoshima Univ, Grad Sch Sci & Engn, Dept Phys & Astron, Kagoshima 8900065, Japan
12.Japan Aerosp Explorat Agcy, Inst Space & Aeronaut Sci, Chuou Ku, Sagamihara, Kanagawa 2298510, Japan
13.Grad Univ Adv Studies, Dept Space & Astronaut Sci, Chuou Ku, Sagamihara, Kanagawa 2298510, Japan
14.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
15.Korea Astron & Space Sci Inst, Taejon 305348, South Korea
Recommended Citation
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).
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).
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).
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