Mapping Observations of 6.7 GHz Methanol Masers with Japanese VLBI Network

Details Mapping Observations of 6.7 GHz Methanol Masers with Japanese VLBI Network Mapping Observations of 6.7 GHz Methanol Masers with Japanese VLBI Network

2007-10-25

arxiv.org/abs/0710.4872v1

Astronomy and Astrophysics

Astrophysics

15 pages, 13 figures, accepted for publication in PASJ

Scientific paper

We have observed 13 methanol maser sources associated with massive star-forming regions; W3(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 $\sim$50 M$\lambda$, and their images are presented. Seven of them are the first VLBI images at 6.7 GHz. This high detection rate and the small fringe spacing of $\sim$4 milli-arcsecond suggest that most of the methanol maser sources have compact structure. Given this compactness as well as the known properties of long-life and small internal-motion, this methanol maser line is suitable for astrometry with VLBI.

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