First weak lensing results from the Red-Sequence Cluster Survey

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dc.creatorHoekstra, Henk
dc.creatorYee, Howard
dc.creatorGladders, Mike
dc.date2001-06-21
dc.date.accessioned2026-07-07T01:59:01Z
dc.date.available2026-07-07T01:59:01Z
dc.descriptionThe Red-Sequence Cluster Survey (RCS) is a 100 square degree galaxy cluster survey designed to provide a large sample of optically selected clusters of galaxies with redshifts 0.1<z<1.4. The survey data are also useful for a variety of lensing studies. Several strong lensing clusters have been discovered so far, and follow up observations are underway. In these proceedings we present some of the first results of a weak lensing analysis based on 24 deg^2 of data. We have detected the lensing signal induced by large scale structure (cosmic shear) at high significance, and find sigma_8=0.79+-0.08 (for a CDM cosmology with Omega_m=0.3,Ω_Λ=0.7, h=0.7). Another application of these data is the study of the average properties of dark matter halos surrounding galaxies. We study the lensing signal from intermediate redshift galaxies with 19.5<R_C<21 using a parameterised mass model for the galaxy mass distribution. The analysis yields a mass weighted velocity dispersion of <sigma^2>^{1/2}= 111+-5 km/s. In addition we have constrained for the first time the extent of dark matter halos, and find a robust upper limit for the truncation parameter s<470 h^{-1} kpc (99.7% confidence). A preliminary analysis also excludes a simple ``prediction'' of lensing according to Modified Newtonian Dynamics (MOND) at high confidence.
dc.description4 pages, to appear in the proceedings of the STScI 2001 spring symposium "Dark Universe"
dc.identifierhttps://arxiv.org/abs/astro-ph/0106388
dc.identifierhttp://arxiv.org/abs/astro-ph/0106388
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2944
dc.subjectAstrophysics
dc.titleFirst weak lensing results from the Red-Sequence Cluster Survey
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