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| Paper: |
Probing the Slope of Cluster Mass Profile with Gravitational Einstein
Rings: Application to Abell 1689 |
| Volume: |
446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective |
| Page: |
155 |
| Authors: |
Tu, H.; Limousin, M.; Shu, C. G.; Sygnet, J. F.; Jullo, E.; Kneib, J. P.; Richard, J. |
| Abstract: |
Abell 1689 is one of the most X-ray luminous rich galaxy cluster
with about 200 member galaxies at the center of the field. The
cluster redshift is relatively low redshift (z=0.185). With its Einstein
radius equal to 45″, it is one of the most massive strong
lensing galaxy clusters.
The cluster itself acting as a gravitational lens produces 32
multiple image systems of background galaxies that lie behind it,
forming over 100 arcs in the field. This
situation comes from an exceptional high density peak of background
galaxies along the central line of sight. This probably explains also
the existence of several gravitational rings around galaxy members
reported later by Limousin et al. (2007). In this paper we try to
explore what rings can tell us about the distribution of dark matter
in the cluster itself. |
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