Determining Tangential Peculiar Velocities of Clusters of Galaxies using Gravitational Lensing

Details Determining Tangential Peculiar Velocities of Clusters of Galaxies using Gravitational Lensing Determining Tangential Peculiar Velocities of Clusters of Galaxies using Gravitational Lensing

2002-11-11

arxiv.org/abs/astro-ph/0211227v1

Astrophys.J. 586 (2003) 731-734

Astronomy and Astrophysics

Astrophysics

LateX, 4 pages, 2 figures, accepted for publication in Part 1 of The Astrophysical Journal

Scientific paper

10.1086/346071

We propose two new methods for measuring tangential peculiar velocities of rich clusters of galaxies. Our first method is based on weak gravitational lensing and takes advantage of the differing images of background galaxies caused by moving and stationary gravitational potentials. Our second method is based on measuring relative frequency shifts between multiple images of a single strongly lensed background galaxy. We illustrate this method using the example of galaxy cluster CL 0024+1654.

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