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Are the bandwidth synthesis delay and delay rate observables useful for VLBI imaging?

Published online by Cambridge University Press:  12 April 2016

P. Charlot
P. Charlot*
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 and Observatoire de Paris, Central Bureau of IERS, 61 Avenue de l’Observatoire, 75014 Paris, France

Abstract

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The Band Width Synthesis (BWS) delay and delay rate observables measured by VLBI are used in astrometry to determine positions of extragalactic radio sources with a precision of 0.001”. At this level of precision, extragalactic radio sources exhibit “extended structures that induce significant effects in the measured BWS delays and delay rates. The question whether closure BWS delays and delay rates could supplement the amplitudes and closure phases for VLBI imaging is studied. Preliminary results for the radio source NRAO140 observed in July 1983 are presented.

Type
VLBI Imaging
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 302 - 306
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

Charlot, P. 1990, A. J., 99, 1309.Google Scholar
Charlot, P., Hough, D.H., Lestrade, J.-F. 1989, Astr. Ap., 211, 261.Google Scholar
Cornwell, T.J., Wilkinson, P.N. 1981, M.N.R.A.S., 196, 1067.Google Scholar
Lestrade, J.-F., Mutel, R.L., Preston, R.A., Phillips, R.B. 1985, In Radio Stars, ed Hjellming, R.M. and Gibson, D.M., Reidel, Dordrecht, p. 275.Google Scholar
Readhead, A.C.S., Wilkinson, P.N. 1978, Ap. J., 223, 25.Google Scholar
Thomas, J.B. 1980, NASA-JPL Publ. 80–84.Google Scholar