Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-10-03
Astronomy and Astrophysics
Astrophysics
8 pages including 5 figs, LaTeX, To appear in MNRAS
Scientific paper
10.1046/j.1365-8711.1998.01179.x
To date, the study of high-magnification gravitational lensing effects of galaxy clusters has focused upon the grossly distorted, luminous arc-like features formed in massive, centrally condensed clusters. We investigate the formation of a different type of image, highly magnified yet undistorted, in two widely employed cluster mass density profiles; an isothermal sphere with a core, and a universal dark matter halo profile derived from numerical simulations of Navarro et al. We examine the properties of images of extended sources produced by these two cluster profiles, paying particular attention to the undistorted images. Using simple assumptions about the source and lens population, we estimate the relative frequency of occurrence of highly magnified, undistorted images and the more commonly known giant arcs.
Lewis Geraint F.
Williams Liliya L. R.
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