Lensing by Groups of Galaxies
arXiv:astro-ph/9909303
Abstract
A large fraction of known galaxy-lens systems require a component of external shear to explain the observed image geometries. In most cases, this shear can be attributed to a nearby group of galaxies. We discuss how the dark-matter mass distribution of groups of galaxies can influence the external shear for strongly lensed sources and Calculate the expected weak lensing signal from groups for various mass profiles.
2 pages, 2 figures. Poster presentation at "Gravitational Lensing: Recent Progress and Future Goals", Boston University 1999, eds. T.G. Brainerd and C.S. Kochanek