Astrometry of 6.7GHz Methanol Maser toward W 3(OH) with Japanese VLBI Network

Details Astrometry of 6.7GHz Methanol Maser toward W 3(OH) with Japanese VLBI Network Astrometry of 6.7GHz Methanol Maser toward W 3(OH) with Japanese VLBI Network

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63.1345m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.63, No.6, pp.1345-1356

Astronomy and Astrophysics

Astronomy

Astrometry, Ism: Individual (Westerhout 3(Oh)), Masers, Stars: Distances, Stars: Kinematics

Scientific paper

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 GHz methanol masers suggest a rotating and expanding torus structure surrounding the UC H II region.

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