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Time delays in cosmology with gravitational lenses

Published online by Cambridge University Press:  30 September 2008

A. Oscoz ,
E. Mediavilla ,
M. Serra-Ricart  and
E.E. Falco
E.E. Falco*
Affiliation:
F.L. Whipple Observatory, Smithsonian Institution, PO Box 6369, Amado, AZ 85645, USA
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Abstract

Gravitational lenses yield a very high rate of return onobservational investment. Given their scarcity, their impact on ourknowledge of the universe is very significant. In the weak-fieldlimit, lensing studies are based on well-established physics and thusoffer a straightforward approach to pursue many currently pressingproblems of astrophysics and cosmology. Examples of these are thesignificance of dark matter and the density, age and size of theuniverse. I present recent developments in cosmological applicationsof gravitational lenses, focusing on estimates of the Hubble constantusing strong lensing of quasars. I describe our recent measurements oftime delays for the images of SDSS J1004+4112, and discuss prospects forthe future utilizing synoptic telescopes, planned and underconstruction.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 30: Spanish Relativity Meeting - Encuentros Relativistas Españoles, ERE2007: Relativistic Astrophysics and Cosmology , 2008 , pp. 51 - 68
Copyright
© EAS, EDP Sciences, 2008

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