Sub-Milliarcsecond Precision of Pulsar Motions: Using In-Beam Calibrators with the VLBA

Details Sub-Milliarcsecond Precision of Pulsar Motions: Using In-Beam Calibrators with the VLBA Sub-Milliarcsecond Precision of Pulsar Motions: Using In-Beam Calibrators with the VLBA

1999-03-02

arxiv.org/abs/astro-ph/9903042v1

Astronomy and Astrophysics

Astrophysics

11 pages plus 4 figures. In press, Astronomical Journal

Scientific paper

10.1086/300877

We present Very Long Baseline Array phase-referenced measurements of the parallax and proper motion of two pulsars, B0919+06 and B1857-26. Sub-milliarcsecond positional accuracy was obtained by simultaneously observing a weak calibrator source within the 40' field of view of the VLBA at 1.5 GHz. We discuss the merits of using weak close calibrator sources for VLBI observations at low frequencies, and outline a method of observation and data reduction for these type of measurements. For the pulsar B1919+06 we measure a parallax of 0.31 +/- 0.14 mas. The accuracy of the proper motions is approximately 0.5 mas, an order of magnitude improvement over most previous determinations.

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