Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6004t&link_type=abstract
HST Proposal ID #6004
Computer Science
Hst Proposal Id #6004 Galaxies &Amp, Clusters
Scientific paper
We propose to obtain a map of the mass, including the dark matter, in the core of the richest galaxy cluster, Abell 1689 at z=0.18. The only way to do this is to take very deep images of the cluster and measure the gravitational lens distortion of the blue background galaxy population. The confirmation of distortions in the lensed background galaxies inferred from very deep ground-based observations will allow us to produce a high quality map of the cluster mass distribution over a range of scales from 10 kpc to 1 Mpc, revealing the nature of the non-singular mass core. The detailed shape of this mass core inside 100 kpc will contain information on the nature of the dark matter and the scenario for sub-structure formation in clusters of galaxies. Background galaxies in the range B=24- 26 are very compact {r<0.5 arcsec} and, in order to constrain lens models, it is essential to measure both the width and the length of the distorted galaxies--accurate width measurement is virtually impossible with ground-based resolution.
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