Ricardo A. Flores et al. 2000 ApJ 535 555 doi:10.1086/308878
Arc Statistics in Clusters: Galaxy Contribution
FREERicardo A. Flores1, Ariyeh H. Maller2 and Joel R. Primack2
Show affiliationsThe frequency with which background galaxies appear as long arcs as a result of gravitational lensing by foreground clusters of galaxies has recently been found by Bartelmann et al. to be a very sensitive probe of cosmological models. They have found that such arcs would be expected far less frequently than observed (by an order of magnitude) in the currently favored model of the universe, with a large cosmological constant, ΩΛ ~ 0.7. Here we analyze whether including the effect of cluster galaxies on the likelihood of clusters to generate long-arc images of background galaxies can change the statistics. Taking into account a variety of constraints on the properties of cluster galaxies, we find that there are not enough sufficiently massive galaxies in a cluster for them to significantly enhance the cross section of clusters and generate long arcs. We find that cluster galaxies typically enhance the cross section by only 
15%.
- Subject headings
cosmology: theory; dark matter; galaxies: clusters: general; gravitational lensing
- Dates
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Issue 2 (2000 June 1)
Received 1999 September 23, accepted for publication 2000 January 26
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Arc Statistics in Clusters: Galaxy Contribution
Ricardo A. Flores et al. 2000 ApJ 535 555
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