Source Ellipticity and the Statistics of Lensed Arcs

Details Source Ellipticity and the Statistics of Lensed Arcs Source Ellipticity and the Statistics of Lensed Arcs

Publishing date

2001-07-18

URL

arxiv.org/abs/astro-ph/0107342v1

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info

4 pages, emulateapj5; accepted in ApJ

Type

Scientific paper

Digital Object Identifier

10.1086/323441

Abstract

The statistics of gravitationally lensed arcs, which can be used for a variety of cosmological tests, are sensitive to the intrinsic shapes of the source galaxies. I present an analytic formalism that makes it simple to include elliptical sources in analytic calculations of lens statistics. For cuspy lens models, sources with an axis ratio of 2:1 enhance the total number of arcs longer than 10:1 by a factor of order two, while modestly decreasing the number ratio of radial arcs to tangential arcs. Source ellipticity is therefore an important systematic effect in detailed quantitative studies, but it should not hinder cosmological applications such as attempts to constrain cluster dark matter profiles with arc statistics.

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