Mass Distributions of Clusters Using Gravitational Magnification

Details Mass Distributions of Clusters Using Gravitational Magnification Mass Distributions of Clusters Using Gravitational Magnification

1995-05-03

arxiv.org/abs/astro-ph/9505010v1

Astronomy and Astrophysics

Astrophysics

10 pages uuencoded, compressed, figures included. Invited Review, proc of 5th Maryland Dark Matter Oct. 94

Scientific paper

10.1063/1.48351

Lensing in the context of rich clusters is normally quantified from small image distortions, yielding a relative mass distribution in the limit of weak lensing. Here we show the magnification effect of lensing can also be mapped over a cluster, resulting in absolute mass determinations for the weak limit. Furthermore, given both magnification and distortion measurements, the mass distribution may be constrained in the strong regime. Methods for obtaining the magnification using spectroscopic and/or photometric information are discussed, for object detection within a fixed isophote or to a given flux limit. A map of the magnification around A1689 is constructed from the observed depletion of background red galaxy counts.

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