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VLBA Phase-Referencing

Published online by Cambridge University Press:  19 July 2016

A.J. Beasley ,
J.E. Conway ,
P.J. Diamond ,
W.D. Cotton  and
R.C. Vermeulen
A.J. Beasley
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0 Socorro NM USA 87801 *
J.E. Conway
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0 Socorro NM USA 87801 *
P.J. Diamond
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0 Socorro NM USA 87801 *
W.D. Cotton
Affiliation:
National Radio Astronomy Observatory, Edgemont Rd., Charlottesville VA USA 22903
R.C. Vermeulen
Affiliation:
California Institute of Technology, Pasadena CA USA 91125 **

Abstract

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Residual delay errors in VLBI data limit the image sensitivity and dynamic range attainable using current calibration techniques such as self-calibration. Applying phase corrections derived from regular observations of nearby calibrators (phase-referencing), the residual delay errors on a target source can be reduced, increasing coherent integration times. In this paper we present the results of a series of observations made with the VLBA to examine the effectiveness of phase-referencing for improving instrumental phase stability. Optimum observing strategies when studying weak (~ mJy) sources are discussed.

Keywords

Phase-referencingVLBAcalibrationatmosphere
Type
Imaging Techniques
Information
Symposium - International Astronomical Union , Volume 158: Very High Angular Resolution Imaging , 1994 , pp. 105 - 108
Copyright
Copyright © Kluwer 1994