Statistics of gravitational lenses in the clumpy Universe

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dc.creatorCovone, G.
dc.creatorSereno, M.
dc.creatorde Ritis, R.
dc.date2005-01-24
dc.date.accessioned2026-07-07T02:16:50Z
dc.date.available2026-07-07T02:16:50Z
dc.descriptionWe evaluate the effect of small scale inhomogeneities on large scale observations within the statistics of gravitationally lensed quasars. At this aim, we consider a cosmological model whose large scale properties (dynamics, matter distribution) are the same as in Friedmann-Lemaitre models, but whose matter distribution is locally inhomogeneous. We use the well known Dyer-Roder distances to allow a simple analytical expression of the optical depth, and pay particular attention on the different role played by the different notions of distances (filled beam angular diameter distance and Dyer-Roder distances) when calculating this quantity, following the prescription from Ehlers & Schneider for a coherent formalism. We find that the expected number of gravitationally lensed quasars is a decreasing function of the clumpiness parameter.
dc.description11 pages, 9 figures. MNRAS, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0501509
dc.identifierhttp://arxiv.org/abs/astro-ph/0501509
dc.identifierMon.Not.Roy.Astron.Soc. 357 (2005) 773-782
dc.identifierdoi:10.1111/j.1365-2966.2005.08702.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8943
dc.subjectAstrophysics
dc.titleStatistics of gravitational lenses in the clumpy Universe
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