The cluster lens ACO 1703: redshift contrast and the inner profile
| dc.creator | Saha, Prasenjit | |
| dc.creator | Read, Justin I. | |
| dc.date | 2008-07-29 | |
| dc.date.accessioned | 2026-07-07T12:15:08Z | |
| dc.date.available | 2026-07-07T12:15:08Z | |
| dc.description | 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 ρ\propto r^{-1} out to 200 kpc. But if the quint is omitted, both shallower and steeper models (e.g., ρ\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. | |
| dc.description | To appear in ApJ. High resolution version and Java Applet that allows for real-time modelling of A1703 available at http://justinread.net | |
| dc.identifier | https://arxiv.org/abs/0807.4737 | |
| dc.identifier | http://arxiv.org/abs/0807.4737 | |
| dc.identifier | Astrophys.J.690:154-162,2009 | |
| dc.identifier | doi:10.1088/0004-637X/690/1/154 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/211419 | |
| dc.subject | Astrophysics | |
| dc.title | The cluster lens ACO 1703: redshift contrast and the inner profile | |
| dc.type | text |