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The Extragalactic Radio/Optical Reference Frame

Published online by Cambridge University Press:  12 April 2016

Kenneth J. Johnston ,
Jane L. Russell ,
Christian de Vegt ,
N. Zacharias ,
R. Hindsley ,
J. Hughes ,
D.L. Jauncey ,
J.E. Reynolds ,
G. Nicholson  and
C. Ma
Kenneth J. Johnston
Affiliation:
U.S. Naval Research Laboratory
Jane L. Russell
Affiliation:
Applied Research Corporation
Christian de Vegt
Affiliation:
Hamburger Sternwarte
N. Zacharias
Affiliation:
Hamburger Sternwarte
R. Hindsley
Affiliation:
United States Naval Observatory
J. Hughes
Affiliation:
United States Naval Observatory
D.L. Jauncey
Affiliation:
Division of Radiophysics CSIRO
J.E. Reynolds
Affiliation:
Mt Stromlo and Siding Springs ObservatoryAustralian National University
G. Nicholson
Affiliation:
CSIRNational Institute for Telecommunications Research
C. Ma
Affiliation:
Goddard Space Flight Center, NASA

Extract

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The celestial positions of extragalactic radio sources may be determined to a precision of less than a milliarcsecond. Further, since these sources are believed to be at great distances from the galaxy, little or no proper motion is expected on scales of order a milliarcsecond. Therefore a reference frame based on the positions of carefully selected sources so that display compact radiation on scales less than a milliarcsecond will noticeably improve the precision of present celestial reference frames. If the radio objects making up the reference frame also emit radiation at optical wavelengths, and assuming the optical/radio radiation is coincident, the radio frame can update the optical frame to the accuracy of the individual optical positions.

Type
Part 1. Oral Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 123 - 129
Copyright
Copyright © United States Naval Observatory 1991

References

Argue, A.N., deVegt, C., Elsmore, B., Fanselow, J., Harrington, R., Hemenway, P., Johnston, K.J., Kuhr, M., Kumkova, I., Neil, A.E., Walter, H., Witzel, A., (1984) Astronomy and Astrophysics 130, 191–192 Google Scholar
Johnston, K.J., Russell, J.L., deVegt, C., Hughes, J., Jauncey, D., White, G., Nicolson, G., (1988) in “The Impact of VLBI on Astrophysics and Geophysics” IAU Symposium, 129, Reid, M. and Moran, J., eds., Reidel, Dordrecht, 317.Google Scholar
Ma, C., Shaffer, D.B., deVegt, C., Johnston, K.J., Russell, J.L., (1990) Astronomical Journal 99, 1284.CrossRefGoogle Scholar
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