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Phase-referenced VLBA Observations of PSRs B1937+21 and B0329+54

Published online by Cambridge University Press:  12 April 2016

Rachel J. Dewey  and
Anthony J. Beasley
Rachel J. Dewey
Affiliation:
Physics Department, Princeton University
Anthony J. Beasley
Affiliation:
National Radio Astronomy Observatory

Extract

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In this paper we present the preliminary results of phase-referenced VLBA observations of two pulsars PSRB1937+21 and PSRB0329+54. Since pulsar observations usually require a lower observing frequency than that used for other astrometric applications, ionospheric delays are a significant source of systematic error. For the observations presented here we used total-electron-content (TEC) measurements derived from dual-frequency GPS observations (Wilson, Mannucci & Edwards, 1995) to calibrate ionospheric delays.

Using this calibration technique were able to obtain positions for these two pulsars which we believe to be accurate to approximately 2 mas in each coordinate. With this level of accuracy we expect astrometric pulsar observations to be able to address a variety of interesting issues ranging from reference frame alignment and fundamental astrometry to the origin of pulsar velocities.

Type
Part 2 Precision Measurements
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 115 - 116
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Dewey, R.J., Ojeda, M.J., Gwinn, C.R., Jones, D.L., and Davis, M.M. 1996 AJ, 111,315.Google Scholar
Folkner, W.M., Chariot, P., Finger, M.H., Williams, J.G., Newhall, X.X., and Standisti, E.M. 1994, A&A, 297, 279.Google Scholar
Petit, G. 1994, Ph.D. thesis, Paris Observatory.Google Scholar
Wilson, B.D., Mannucci, A.J. & Edwards, C.D. 1995, Radio Science, 30, 639.Google Scholar