Mapping observations of 6.7 GHz methanol masers with the Japanese VLBI network

被引：30

作者：

Sugiyama, Koichiro ^{[1
]}

Fujisawa, Kenta ^{[2
]}

Doi, Akihiro ^{[2
,3
]}

Honma, Mareki ^{[4
,5
]}

Kobayashi, Hideyuki ^{[4
,6
]}

Bushimata, Takeshi ^{[4
,7
]}

Mochizuki, Nanako ^{[3
]}

Murata, Yasuhiro ^{[3
,8
]}

机构：

[1] Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi, Yamaguchi 7538512, Japan

[2] Yamaguchi Univ, Fac Sci, Dept Phys, Yamaguchi, Yamaguchi 7538512, Japan

[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[4] Natl Astron Observ Japan, VERA Project, Mitaka, Tokyo 1818588, Japan

[5] Grad Univ Adv Studies, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[6] Natl Astron Observ Japan, Mizusawa VERA Observ, Oshu, Iwate 0230861, Japan

[7] Natl Astron Observ Japan, Space VLBI Project, Mitaka, Tokyo 1818588, Japan

[8] Grad Univ Adv Studies, Dept Space & Astron Sci, Sagamihara, Kanagawa 2298510, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2008年 / 60卷 / 01期

关键词：

masers : methanol; techniques : interferometric; very-long-baseline interferometry (VLBI);

D O I：

10.1093/pasj/60.1.23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed 13 methanol maser sources associated with massive star-forming regions: W 3(OH), Mon R2, S 255, W 33A, IRAS 18151-1208, G 24.78+0.08, G 29.95-0.02, IRAS 18556+0136, W 48, OH 43.8-0.1, ON 1, Cep A, and NGC 7538 at 6.7 GHz using the Japanese VLBI Network (JVN). Twelve of the thirteen sources were detected at our longest baseline of similar to 50 MA, and their images are presented. Seven of them are the first VLBI images at 6.7 GHz. The high detection rate and the small fringe spacing of similar to 4 mas suggest that most of the methanol maser sources have compact structures. Given this compactness as well as the known properties of long life and small internal motion, the methanol maser line is suitable for astrometry with VLBI.

引用

页码：23 / 35

页数：13

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