Perturbations of cluster cusps by galaxies - The triple arc in CL 0024+1654

Details Perturbations of cluster cusps by galaxies - The triple arc in CL 0024+1654 Perturbations of cluster cusps by galaxies - The triple arc in CL 0024+1654

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400...41k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 41-57.

Astronomy and Astrophysics

Astrophysics

48

Arcs, Cusps, Galactic Clusters, Gravitational Lenses, Perturbation Theory, Mathematical Models, Topology

Scientific paper

A simple method for analyzing perturbed cusps which does not require detailed numerical modeling is presented. This method is applied to the triple arc in Cl 0024+1654, in which three segments visibly violate the length theorem. It is concluded that, if this arc is indeed created by a single source, it should be formed by a perturbed right-handed cusp, each of the segments should be a single image, and the middle segment should be inverted with respect to the two outer segments. A numerical search for a model of the triple arc, subject to the constraints imposed by the geometry of the segments, is performed. The numerical model found provides a rough picture of the lens potential and predicts that the perturbed cusp is naked and no counterarc is formed. The most recent high-resolution images of the cluster 0024+1654 are reported. They reveal significant substructure in each segment of the triple arc and show that the source is multicomponent: there are two main source galaxies imaged approximately on each edge of the segments.

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