On Arcs and Omega

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dc.creatorBartelmann, Matthias
dc.creatorHuss, Andreas
dc.creatorColberg, Joerg M.
dc.creatorJenkins, Adrian
dc.creatorPearce, Frazer R.
dc.date1997-09-24
dc.date.accessioned2026-07-07T02:24:18Z
dc.date.available2026-07-07T02:24:18Z
dc.descriptionThe gravitational lens effect of galaxy clusters can produce large arcs from source galaxies in their background. Typical source redshifts of ~ 1 require clusters at z ~ 0.3 for arcs to form efficiently. Given the cluster abundance at the present epoch, the fewer clusters exist at z ~ 0.3 the higher Omega_0 is, because the formation epoch of galaxy clusters strongly depends on Omega_0. In addition, at fixed Omega_0, clusters are less concentrated, and hence less efficient lenses, when the cosmological constant is positive, Omega_Lambda > 0. Numerical cluster simulations show that the expected number of arcs on the sky is indeed a sensitive function of Omega_0 and Omega_Lambda. The numerical results are compatible with the statistics of observed arcs only in a universe with low matter density, Omega_0 ~ 0.3, and zero cosmological constant. Other models fail by one or two orders of magnitude, rendering arc statistics a sensitive probe for cosmological parameters.
dc.descriptionProceedings contribution, 12th Potsdam Cosmology Workshop, Potsdam, Germany, Sep. 1997; 4 pages, including 2 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/9709229
dc.identifierhttp://arxiv.org/abs/astro-ph/9709229
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11567
dc.subjectAstrophysics
dc.titleOn Arcs and Omega
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