Mathematics – Logic
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10492e&link_type=abstract
HST Proposal ID #10492
Mathematics
Logic
Hst Proposal Id #10492 Cosmology
Scientific paper
We propose to obtain deep, multi-colour imaging for the galaxy cluster RX J1347-1145 at z=0.45. Together with our high-quality ground-based optical and X-ray data sets already at hand this observation will produce a precise mass determination of this most X-ray luminous cluster. The analysis will mainly be carried out by a newly developed and novel technique that combines weak and strong lensing information and which is able to break the mass-sheet degeneracy that hampered most previous lensing mass determinations. Within our extensive campaign to understand the mass properties of RX J1347-1145, the main goal of the ACS images will be a refined, high-resolution lensing mass reconstruction of the cluster core. This will be achieved by a substantially increased number density of background sources for a weak lensing analysis in combination with constraints from multiply lensed images that are identified with morphology and colour information. Both of these require the unique resolving power of ACS. RX J1347-1145 is an ideal candidate for elucidating the discrepant mass estimates obtained from traditional methods. It plays the same role at high redshift as A1689 at intermediate redshifts for which a similar analysis has been performed with ACS. Our results will therefore be an important ingredient in the use of galaxy clusters as cosmological probes.
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