Lensing by Groups of Galaxies

Details Lensing by Groups of Galaxies Lensing by Groups of Galaxies

1999-09-17

arxiv.org/abs/astro-ph/9909303v2

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures. Poster presentation at "Gravitational Lensing: Recent Progress and Future Goals", Boston University 1999,

Scientific paper

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.

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