Physics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350..211r&link_type=abstract
Nature (ISSN 0028-0836), vol. 350, March 21, 1991, p. 211, 212.
Physics
60
Galactic Structure, Gravitational Lenses, Hubble Constant, Quasars, Red Shift, Annual Variations, Charge Coupled Devices, Galactic Clusters, Line Of Sight
Scientific paper
The double quasar Q0957 + 561 AB is believed to be a gravitationally lensed image formed by a galaxy at redshift z = 0.36: a single quasar at z = 1.41 is seen as two images because of the intervening galaxy. A measurement of the velocity dispersion of the intervening galaxy is presented here which, combined with a measurement of the time delay between the appearance of brightness variations in the two images, can be applied to a simple model of the lensing geometry to yield an estimate for the Hubble constant H0. The flux form the A and B images has been monitored for several years by two groups and a consistent value of 415 days for the time delay between variations A ande B has been obtained. The measured line-of-sight velocity dispersion for the intervening galaxy of 303 + or - 50 km/s then gives H0 = 50 + or - 17 km/s/Mpc.
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