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Can We Measure H0 with VLBI Observations of Gravitational Images?

Published online by Cambridge University Press:  03 August 2017

E. E. Falco ,
M. V. Gorenstein  and
I. I. Shapiro
E. E. Falco
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.
M. V. Gorenstein
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.
I. I. Shapiro
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.

Abstract

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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 H0 with an uncertainty of ∼ 20% due mainly to uncertainties in our assumptions.

Type
Extragalactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 207 - 208
Copyright
Copyright © Reidel 1988 

References

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