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Nearly Microarcsecond Precision Differential Astrometry

Published online by Cambridge University Press:  04 August 2017

J. Marcaide ,
I. Shapiro ,
J. Ball ,
N. Bartel ,
T. Clark ,
B. Corey ,
M. Gorenstein ,
R. Preston ,
M. Ratner  and
A. Rogers
...Show all authors
J. Marcaide
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
I. Shapiro
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
J. Ball
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
N. Bartel
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
T. Clark
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
B. Corey
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
M. Gorenstein
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
R. Preston
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
M. Ratner
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
A. Rogers
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.
A. Whitney
Affiliation:
1Max-Planck-Institut für Radioastronomie, Bonn, F.R.G.

Extract

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In studies of extragalactic radio sources with multiple compact components the determination of which components, if any, are stationary and which moving is of importance. In order to learn about the radio properties of the individual components it is also relevant to be able to register maps made at several wavelengths. Both tasks are usually not possible with VLBI because of the irrecoverable corruption of the fringe phase introduced by the propagation medium and the instrumentation. However, when two or more compact radio sources are separated by only a small angle from each other difference techniques can be used to help tackle both questions.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 361 - 362
Copyright
Copyright © Reidel 1984 

References

Marcaide, J.M.: 1982, , Massachusetts Institute of Technology Google Scholar
Marcaide, J.M. and Shapiro, I.I.: 1983, Astron. J. (to appear in August 1983 issue) Google Scholar