Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..252d&link_type=abstract
NOAO Proposal ID #1999A-0252
Computer Science
Scientific paper
Models of the formation of galaxy clusters predict an outer cutoff radius, beyond which the total enclosed mass rapidly converges. Such a cutoff has not yet been observed. We propose to measure the lensing shear of the galaxy cluster A1689 over a 40 arcmin (7 Mpc) field, to test the ``universal" profile of Navarro et al. Measuring the mass distribution in the outskirts of clusters also provides an opportunity to detect the associated large-scale filaments/walls of the kind expected from n-body CDM simulations. We have HST WFPC2 data on the central 2.5 arcmin of this cluster, over which the mass distribution will be precisely defined via strong lensing analysis. By using this HST data to normalize the wide area KPNO map, we will determine the mass distribution for this cluster out to 4h^-1 Mpc with unprecedented precision. This mass map will be compared with the existing ROSAT and S- Z maps for the cluster to provide a clear picture of the gas and mass distribution. In order to completely account for systematics, we will also observe one ``blank" field to comparable depth. This will allow us to calibrate the shear, as well as estimate the degree of contamination from the lensing of high redshift clusters and galaxy-galaxy lensing.
Dell'Antonio Ian
Kochanski Greg
Tyson Anthony J.
Wittman David
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