Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-29
Astrophys.J.690:154-162,2009
Astronomy and Astrophysics
Astrophysics
To appear in ApJ. High resolution version and Java Applet that allows for real-time modelling of A1703 available at http://jus
Scientific paper
10.1088/0004-637X/690/1/154
ACO 1703 is a cluster recently found to have a variety of strongly lensed objects: there is a quintuply-imaged system at z=0.888 and several other lensed objects from z=2.2 to 3.0 (the cluster itself is at z=0.28). It is not difficult to model the lens, as previous work has already done. However, lens models are generically non-unique. We generate ensembles of models to explore the non-uniqueness. When the full range of source redshifts is included, all models are close to \rho \propto r^{-1} out to 200 kpc. But if the quint is omitted, both shallower and steeper models (e.g., \rho \propto r^{-2}) are possible. The reason is that the redshift contrast between the quint and the other sources gives a good measurement of the enclosed mass at two different radii, thus providing a good estimate of the mass profile in between. This result supports universal profiles and explains why single-model approaches can give conflicting results. The mass map itself is elongated in the NW-SE direction, like the galaxy distribution. An overdensity in both mass and light is also apparent to the SE, which suggests meso-structure.
Read Justin I.
Saha Prasenjit
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