2005/06/23 by Antonaldo Diaferio, Margaret J. Geller, Kenneth J. Rines · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Caustic (mathematics) #Cluster (spacecraft) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Mass distribution #Redshift #Scientific Research and Discoveries #Velocity dispersion #Virial theorem #Weak gravitational lensing #astro-ph
paper · pdf · doi:10.1086/432880
published as Astrophys.J.628:L97-L100,2005 · 5 pages, 1 figure, ApJ Letters, in press
arxiv created 2005/06/23 · openalex publication_date 2005/07/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 ~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 ≲ 0.5.