Towards Determination of the Outer Galactic Rotation Curve

Details Towards Determination of the Outer Galactic Rotation Curve Towards Determination of the Outer Galactic Rotation Curve

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..217h&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

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To determine the outer Galactic rotation curve we observed the Galactic water maser source W3(OH) relative to an adjacent extragalactic continuum source ICRF0241+622, with phase reference VLBI. The observations were carried out using the VLBA at 22GHz. Preliminary results from the observations indicate that the detected proper motions of W3(OH) relative to the extragalactic source follow an elliptical orbit. The proper motions of masers due to Galactic rotation, Solar motion and intrinsic motion are nearly linear; therefore, this ``orbit" is mainly due to annual parallax. We also observed other Galactic water maser sources with the VLA. We found useful sources for phase reference VLBI astrometry.

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