Gravitational lensing, time delay, and angular diameter distance

Details Gravitational lensing, time delay, and angular diameter distance Gravitational lensing, time delay, and angular diameter distance

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378l...5n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. L5-L9.

Mathematics

Logic

36

Dark Matter, Distance, Galaxies, Gravitational Lenses, Hubble Constant, Time Lag, Cosmology, Diameters, Mass Distribution

Scientific paper

It is shown here that a gravitational lens model coupled with a measured time delay gives an estimate of the angular diameter distance d(OL) from the observer to the lens. The determination of d(OL) requires neither a knowledge of the distance to the source and is independent of cosmological parameters such as H(0), q(0), or lambda. In the case of the gravitational lens Q0957 + 561, where the lens is at a redshift of 0.36, the result is d(OL) = 1700 + or - 600 Mpc. If the mass distribution of the cluster surrounding the primary lens in Q0957 + 561 can be determined through independent observations, then it may be possible to estimate both H(0) and q(0).

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