Astrometry of 6.7 GHz Methanol Maser toward W 3(OH) with Japanese VLBI Network
Naoko Matsumoto,Mareki Honma,Yasuko Isono,Hideki Ujihara,Kimihiro Kimura,Kouhei Matsumoto,Satoko Sawada-Satoh,Akihiro Doi,Kenta Fujisawa,Yuji Ueno +9 more
TLDR
In this paper, the results of multiepoch VLBI observations for a 6.7 GHz methanol maser toward the UC H II region of W 3(OH) with Japanese VLBi Network (JVN) were derived, and the trigonometric annual parallax to be 0.598 ˙ 0.067 mas.Abstract:
We present the results of multiepoch VLBI observations for a 6.7 GHz methanol maser toward the UC H II region of W 3(OH) with Japanese VLBI Network (JVN). Based on phase-referencing VLBI astrometry, we derived the trigonometric annual parallax to be 0.598 ˙ 0.067 mas, corresponding to a distance of 1.67 +0:21 � 0:17 kpc. This is the first detection of parallax for a 6.7 GHz methanol maser with JVN, and demonstrates that JVN/VERA is capable of conducting VLBI astrometry for 6.7 GHz methanol maser sources within few kpc from the Sun. Based on in-beam mapping of the W 3(OH) methanol maser, we also measured the internal proper motions of its 6.7 GHz methanol maser for the first time. The internal proper motions basically show north–south expansion with a velocity of few km s � 1 , being similar to OH masers. The spatial distribution and the internal proper motions of 6.7 GHzread more
Citations
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Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm
Yuefang Wu,Yuefang Wu,Mayumi Sato,Mark J. Reid,L. Moscadelli,B. Zhang,Y. Xu,Andreas Brunthaler,Karl M. Menten,Thomas M. Dame,Xingwu Zheng +10 more
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The First VERA Astrometry Catalog
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Capabilities and prospects of the East Asia Very Long Baseline Interferometry Network
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Rotating and Infalling Motion around the High-Mass Young Stellar Object Cepheus A-HW2 Observed with the Methanol Maser at 6.7 GHz
Koichiro Sugiyama,Kenta Fujisawa,Akihiro Doi,Akihiro Doi,Mareki Honma,Hiroshi Kobayashi,Yasuhiro Murata,Yasuhiro Murata,Kazuhito Motogi,Kotaro Niinuma,Hideo Ogawa,Kiyoaki Wajima,Satoko Sawada-Satoh,Simon Ellingsen +13 more
TL;DR: In this paper, the authors measured the internal proper motions of the 6.7 GHz methanol masers associated with Cepheus A (Cep A) HW2 using Very Long Baseline Interferometery (VLBI) observations.
References
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Trigonometric parallaxes of 6.7 GHz methanol masers
K. L. J. Rygl,Andreas Brunthaler,Mark J. Reid,Karl M. Menten,H. J. van Langevelde,H. J. van Langevelde,Ye Xu +6 more
TL;DR: In this paper, the 6.7 GHz methanol maser transition is used to perform high-precision astrometry to obtain accurate distances to the host regions of massive star-forming regions.
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