Cluster mass estimation from number counts of background galaxies

Details Cluster mass estimation from number counts of background galaxies Cluster mass estimation from number counts of background galaxies

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998newar..42..149v&link_type=abstract

New Astronomy Reviews, Volume 42, Issue 2, p. 149-152.

Astronomy and Astrophysics

Astronomy

Scientific paper

The mass of a cluster of galaxies can be estimated from its lens magnification, which can be determined from the variation in number counts of background galaxies. In order to derive the mass one needs to make assumptions for the lens shear, which is unknown from the variation in number counts alone. Furthermore, one needs to go beyond the weak lensing (linear) approximation as most of the observational data is concentrated in the central parts of clusters, where the lensing is strong. We show that using approximations for the shear as a function of the lens convergence one can fairly well reconstruct the surface mass distribution from number counts alone.

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