Mathematics – Logic
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990qjras..31..305b&link_type=abstract
Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 31, Sept. 1990, p. 305-331.
Mathematics
Logic
26
Cosmology, Gravitational Lenses, Quasars, Dark Matter, Galactic Clusters, Red Shift, Very Long Base Interferometry
Scientific paper
The imaging of cosmologically distant point and extended sources, specifically quasars, galaxies and radio sources by intervening masses, is described. Particular attention is paid to formalisms which allow one to understand the qualitative principles governing image formation and procedures which furnish information on the structure of the source and the lens. The importance of caustics is emphasized, particularly their role in the formation of highly magnified images. Although gravitational lenses have been welcomed as powerful probes of dark matter, cosmographic tools, and giant telescopes, they have not yet fulfilled their promise in any of these areas. Despite this, it is argued that gravitational lenses will soon become important tools for extragalactic astronomy. It is suggested that large-scale structure can also be probed using gravitational distortion of the images of high redshift galaxies.
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