Journal
ASTROPHYSICAL JOURNAL
Volume 628, Issue 2, Pages L97-L100Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/432880
Keywords
cosmology : miscellaneous; cosmology : observations; galaxies : clusters : individual (Abell 2390; Cl 0024+1654, MS 1358.4+6245); gravitational lensing
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There are only two methods for estimating the mass distribution in the outer regions of galaxy clusters, where virial equilibrium does not hold: weak gravitational lensing and identification of caustics in redshift space. For the first time, we apply both methods to three clusters: Abell 2390, MS 1358.4 + 6245, and Cl 0024 + 1654. The two measures are in remarkably good agreement out to similar to 2 h(-1) Mpc from the cluster centers. This result demonstrates that the caustic technique is a valuable complement to weak lensing. With a few tens of redshifts per square comoving megaparsec within the cluster, the caustic method is applicable for any z less than or similar to 0.5.
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