Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8249k&link_type=abstract
HST Proposal ID #8249
Mathematics
Logic
1
Hst Proposal Id #8249 Clusters Of Galaxies And Lensing
Scientific paper
We propose to use WFPC2 for a gravitational lensing survey of the central regions of 16 X-ray luminous clusters from a statistically complete sample. Our sample is based on cluster detections in the ROSAT All-Sky Survey and is representative of the population of rich clusters at z 0.2. The proposed WFPC2 survey will, for the first time, provide an unbiased view of strong lensing {arcs, multiply imaged systems and arclets} by such systems. Specifically, the strong lensing features and the shear field in the central regions of these clusters will be used to reconstruct accurately the mass distribution from galaxy to cluster scales. The resulting mass maps will be compared with HRI and ASCA observations in order to probe the dynamical state of, and the prevalence of substructure in, the cluster core. In combination with other indicators of the clusters' evolutionary state {e.g. the presence of a stable cooling flow} our study will provide the first coherent picture of mass accretion onto clusters at an epoch where cluster growth through mergers is expected to be common. Furthermore, the accurate mass models resulting from this survey will allow us to probe fundamental properties of the distant galaxy population, as well as provide new natural lenses for observations at longer wavelengths. Finally, the proposed observations will allow us to investigate the morphological mix and evolution of the cluster galaxy population.
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