Gravitational lens optics

Details Gravitational lens optics Gravitational lens optics

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...245..824b&link_type=abstract

Science (ISSN 0036-8075), vol. 245, Aug. 25, 1989, p. 824-830.

Physics

Optics

25

Cosmology, Galactic Clusters, Gravitational Lenses, Hubble Constant, Optics, Quasars, Imaging Techniques, Statistical Analysis

Scientific paper

Several instances of multiple imaging of cosmologically distant sources by intervening galaxies and galaxy-clusters have been discovered over the past decade. These 'gravitational lenses' have distinctive optical properties. Point-like sources such as quasars generally produce two or four images when lensed, whereas extended sources such as galaxies produce spectacular arcs and rings. The salient features of most of the observations can be reproduced with the use of simple elliptical lens models that approximate the lenses made by ellipsoidal mass distributions such as are common in the universe. In addition to illustrating simple optics in operation on a cosmological scale, multiple images and arcs provide useful probes of the lensing galaxies and clusters. Also, gravitational lenses can make magnified images of cosmologically distant sources and may eventualy furnish important cosmographic data such as the Hubble constant.

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