Computer Science
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983s%26t....66..390g&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 66, Nov. 1983, p. 390-395.
Computer Science
3
Gravitational Lenses, Quasars, Galaxies, Mass Distribution, Ray Tracing, Relativistic Theory
Scientific paper
Features of gravitational lenses are described, together with several examples of seemingly identical celestial objects which were later proved to be the same object. The first evidence was concerned with the object 0957+561, which featured two quasars 6 arcsec apart that displayed equal redshifts, magnitudes, and recession velocities, while the northern component exhibited 30 percent weaker emission and absorption. It was suggested that a galaxy interposed between the earth and a quasar was deflecting its emissions and causing it to be viewed as two distinct objects, i.e., a gravitational lens existed. Later evidence for the intervening galaxy was found, and also permitted attributing the anomalous redshift observed to a contribution from the galaxy. The light bending effect is predicted by the General Theory of Relativity, and is illustated in terms of a point mass, convex lens, and a galaxy.
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