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| Paper: |
Detecting Outer Galactic Rotation through Phase-Referencing VLBI Astrometry with Water Masers |
| Volume: |
230, Galaxy Disks and Disk Galaxies |
| Page: |
59 |
| Authors: |
Hachisuka, H.; Vera Project Team |
| Abstract: |
We measured proper motions of water masers in Galactic star forming region IRAS 21008+4700 and W3(OH) relative to celestial positions of an adjacent extragalactic continuum sources. The observations were carried out by VLBA at 22 GHz in two epochs separated by a month in the phase-referencing mode with source switching cycle of 40 seconds. We detected proper motions of these sources which are well explained by compound effects of Galactic rotation, solar motion and annual parallax. These results seem to show a feasibility of the phase-referencing VLBI maser astrometry in the Galactic dynamics. |
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