Strong Lensing, dark matter and H_0 estimate

Details Strong Lensing, dark matter and H_0 estimate Strong Lensing, dark matter and H_0 estimate

2007-02-19

arxiv.org/abs/astro-ph/0702501v1

Astronomy and Astrophysics

Astrophysics

Published in the Proceedings of the "I Workshop of Astronomy and Astrophysics for Students", Eds. N.R. Napolitano & M. Paolill

Scientific paper

Gravitational lensing represents a powerful tool to estimate the cosmological pa- rameters and the distribution of dark matter. I will describe the main observable quantities, concentrating on strong lensing, that manifests its effect through the formation of spectacular events, like multiple quasars, Einstein rings and arcs in clusters of galaxies. In events where a quasar is lensed by an intervening galaxy, it is possible to give an estimate of the Hubble constant H_0, by choosing a mass density model for the lens, thus allowing to constrain the dark matter content.

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