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A Progress Report on the Establishment of the Radio / Optical Reference Frame

  • J. L. Russell (a1), K. J. Johnston (a1), C. de Vegt (a2), N. Zacharias (a2), C. Ma (a3) (a4), D. Shaffer (a3) (a4), D. L. Jauncey (a5), G. L. White (a5), G. Nicolson (a6), A. Kemball (a6), R. Hindsley (a7), J. Hughes (a7) and J. E. Reynolds (a8)...

Extract

In 1987 we began a 5-year program to establish a reference system of at least 400 extragalactic sources which are compact and flat spectrum in the radio and which also display optical emission. This reference frame is to be global with about one source per 100 sq deg (Johnston, et al., 1988). The program incorporates some data which had been obtained previously for other purposes. Altogether, in one or another aspect of the program, 489 sources have been considered so far.

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References

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Argue, A.N., de Vegt, C., Elsmore, B., Fanselow, J., Harrington, R., Hemenway, P., Johnston, K.J., Kuehr, H., Kumkova, I., Neill, A.E., Walter, H., and Witzel, A. (1984) Astron. Astrophys. , 130, 191199.
Corbin, T. (1979) in “Modern Astrometry,” IAU Colloq. 48 , Prochazka, F. V. and Tucker, R. H. (eds.), (Univ. Obs., Vienna), p. 505.
Johnston, K.J., Russell, J., de Vegt, C., Hughes, J., Jauncey, D., White, G., and Nicholson, G. (1988) in “The Impact of VLBI on Astrophysics and Geophysics,” IAU Symp. 129 , Reid, M. and Moran, J. (eds.), (D. Reidel, Dordrecht), p. 317.
Ma, C. (1990) this symposium
Ma, C., Shaffer, D.B., de Vegt, Chr., Johnston, K.J., and Russell, J.L. (1990) Astron. J. 99, no. 4.
Russell, J.L., Johnston, K.J., Jauncey, D., White, G., Reynolds, J., Harvey, B., Nothnagel, A., Nicholson, G., Kingham, K., Ma, C., de Vegt, C., Hindsley, R., and Zacharias, N. (1990a) in preparation.
Russell, J.L., Johnston, K.J., Ma, C., Shaffer, D., and de Vegt, C. (1990b) in preparation.
Smith, C., Jackson, E., (1985) Celest. Mechanics 37, 277.

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