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- W2262974906 abstract "We consider the images of a background source formed by a foreground mass distribution in a matter-dominated Friedmann cosmology. We present a transformation that leaves observable properties of these gravitational images invariant; superposing a uniform, projected mass distribution on the initial mass distribution, combined with moving the source position and reducing the value of H/sub 0/, both by an appropriate scale factor, leaves unchanged the positions, relative magnifications, apparent luminosities, and difference in propagation times associated with any two images of the source. Using a compound mass distribution to represent a galaxy-cluster lens, we can account for the positions and relative magnifications of the A and B images of Q0957+561. Since mass cannot be negative, the transformation applied to this lens model yields bounds on the Hubble constant, given the difference ..delta..tau/sub BA/ (in years) between the propagation times associated with the two images: 0" @default.
- W2262974906 created "2016-06-24" @default.
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- W2262974906 date "1985-02-01" @default.
- W2262974906 modified "2023-09-27" @default.
- W2262974906 title "Model-dependent bounds on H/sub 0/ from gravitational images: Application to Q0957+561A,B" @default.
- W2262974906 hasPublicationYear "1985" @default.
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