Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pasj...62..101o&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.62, No.1, pp.101--114
Astronomy and Astrophysics
Astronomy
13
Galaxy: Rotation, Ism: Masers (H2O), Vera
Scientific paper
We present the results of VLBI observations of three H2O maser sources in massive star-forming regions: IRAS 06058+2138, IRAS 19213+1723, and AFGL 2789. We determined the annual parallaxes and proper motions for these sources by a phase-referencing method. The estimated distances to IRAS 06058+2138 and AFGL 2789 are 1.76±0.11kpc and 3.07±0.30kpc, which are located in the Perseus spiral arm. The distance to IRAS 19213+1723 is 3.98±0.57 kpc, placing it in the Carina-Sagittarius arm. With estimated 3-dimensional velocity components, we have shown that the galactic rotation curve is flat in the range of 6.4 kpc ≤ R ≤ 13 kpc as combining with S 269, which was observed with VERA. We have also found that the overall rotation curve of the Galaxy do not depend on Θ0. The maser sources also show deviations from flat rotation curves by a few kilometers per second. We discuss possible reasons for these peculiar motions.
Hirota Tomoya
Honma Mareki
Kobayashi Hideyuki
Oh Chung Sik
Sato Katsuhisa
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