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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2005

Statistics of gravitational lenses in the clumpy Universe

M. Sereno
  • Fonction : Auteur
R. de Ritis
  • Fonction : Auteur

Résumé

We 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.
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Dates et versions

hal-00015074 , version 1 (26-01-2021)

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G. Covone, M. Sereno, R. de Ritis. Statistics of gravitational lenses in the clumpy Universe. Monthly Notices of the Royal Astronomical Society, 2005, 357, pp.773. ⟨10.1111/j.1365-2966.2005.08702.x⟩. ⟨hal-00015074⟩
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