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Can We Measure H 0 with VLBI Observations of Gravitational Images?

  • E. E. Falco (a1), M. V. Gorenstein (a1) and I. I. Shapiro (a1)

Abstract

We have used the relative positions and magnifications of the A and B images in the gravitational lens system 0957+561, obtained from VLBI observations, to constrain a model for the surface mass distribution of the lens. With measurements of the difference ΔτBA in propagation times associated with A and B (the “relative time delay”) and of the velocity dispersion of the main lensing galaxy, both to be obtained, our model will yield a value for H 0 with an uncertainty of ∼ 20% due mainly to uncertainties in our assumptions.

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Copyright

References

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Cohen, N. L., Gorenstein, M. V., Shapiro, I. I., Rogers, A. E. E., Bonometti, R. J., Falco, E. E., Bartel, N., and Marcaide, J. M. 1987, in preparation.
Falco, E. E., Gorenstein, M. V., and Shapiro, I. I. 1985, Ap. J. Letters, 289, L1.
Falco, E. E., Gorenstein, M. V., and Shapiro, I. I. 1987, to be submitted to Ap. J. Gorenstein, M. V. et al. 1984, Ap. J., 287, 538.
Gorenstein, M. V., Falco, E. E., and Shapiro, I. I. 1987, to be submitted to Ap. J. Gorenstein, M. V. et al. 1987, in these Proceedings.
Greenfield, P. E., Roberts, D. H., and Burke, B. F. 1985, Ap. J., 293, 370.
Subramanian, K., Chitre, S. M., and Narasimha, D. 1985, M.N.R.A.S., 210, 79.
Walsh, D., Carswell, R. F., and Weymann, R. J. 1979, Nature, 279, 381.
Young, P., Gunn, J. E., Kristian, J., Oke, J. B., and Westphal, J. A. 1981, Ap. J., 244, 736.

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