Strong Lensing by Galaxy Clusters and ΛCDM

Details Strong Lensing by Galaxy Clusters and ΛCDM Strong Lensing by Galaxy Clusters and ΛCDM

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iaus..225..193d&link_type=abstract

Gravitational Lensing Impact on Cosmology, IAU Symposium, vol. 225. Edited by Yannick Mellier and Georges Meylan, ISBN 052185196

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We discuss how strong lensing by galaxy clusters may be used to study the properties of dark matter halos and the expansion history of the universe. First, we show how the characteristics of ΛCDM clusters determine their lensing properties, and show how these properties are manifested in some of the new giant arcs discovered behind SDSS clusters. Next, we compare the statistics of strong lensing by clusters expected in the ΛCDM model to the observed statistics of giant arcs and wide-separation quasars. Finally, we discuss the cosmographic uses of clusters with multiple arcs, pointing out several sources of noise which can produce ≳100 % errors in derived cosmological parameters.

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