Arc Statistics with Realistic Cluster Potentials. I. Method and First Results

Details Arc Statistics with Realistic Cluster Potentials. I. Method and First Results Arc Statistics with Realistic Cluster Potentials. I. Method and First Results

1993-11-30

arxiv.org/abs/astro-ph/9311074v1

Astronomy and Astrophysics

Astrophysics

26 pages of uuencoded, compressed postscript. MPA preprint no. 772

Scientific paper

{}From the lensing properties of a numerically simulated cluster, from the statistical properties of the giant arcs produced by the cluster, and from comparing the cluster properties derived both from lensing and from the X-ray properties of the intracluster gas, we conclude (1) that clusters may be significantly more efficient for lensing than estimated from their velocity dispersion on the basis of iso- thermal-sphere models, (2) that the discrepancy between cluster core radii derived from lensing and from their X-ray surface brightness may be understood assuming that the intracluster gas was expelled from the cluster galaxies when the dark `body' of the cluster had already formed, and (3) that clusters may be efficient in producing giant arcs even if they have extended cores and a fairly shallow sur- face-density profile. This may mean that arcs may be much easier to produce, and therefore more abundant, than previously estimated.

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