Measuring the mass distribution in the most distant, very X-ray luminous galaxy cluster known

Details Measuring the mass distribution in the most distant, very X-ray luminous galaxy cluster known Measuring the mass distribution in the most distant, very X-ray luminous galaxy cluster known

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9033e&link_type=abstract

HST Proposal ID #9033

Mathematics

Logic

Hst Proposal Id #9033 Cosmology

Scientific paper

We propose to obtain a mosaic of deep HST/WFPC2 images to conduct a weak lensing analysis of the mass distribution in the massive, distant galaxy cluster ClJ1226.9+3332, recently discovered by us. At z=0.888 this exceptional system is more X-ray luminous and more distant than both MS1054.4-0321 and ClJ0152.7-1357, the previous record holders, thus providing yet greater leverage for cosmological studies of cluster evolution. ClJ1226.9+3332 differs markedly from all other currently known distant clusters in that it exhibits little substructure and may even host a cooling flow, suggesting that it could be the first cluster to be discovered at high redshift that is virialized. We propose joint HST and Chandra observations to investigate the dynamical state of this extreme object. This project will 1} take advantage of HST's superb resolution at optical wavelengths to accurately map the mass distribution within 1.9 h-1 50 Mpc via strong and weak gravitational lensing, and 2} use Chandra's unprecedented resolution in the X-ray waveband to obtain independent constraints on the gas and dark matter distribution in the cluster core, including the suspected cooling flow region. As a bonus, the proposed WFPC2 observations will allow us to test the results by van Dokkum et al. {1998, 1999} on the properties of cluster galaxies {specifically merger rate and morphologies} at z 0.8 from their HST study of MS1054.4-0321.

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