Gravitational Imaging in Well-Constrained Clusters: Absolute Masses and Faint Galaxy Redshifts - Cycle 5 DD Observations

Details Gravitational Imaging in Well-Constrained Clusters: Absolute Masses and Faint Galaxy Redshifts - Cycle 5 DD Observations Gravitational Imaging in Well-Constrained Clusters: Absolute Masses and Faint Galaxy Redshifts - Cycle 5 DD Observations

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.7201s&link_type=abstract

HST Proposal ID #7201

Statistics

Applications

Hst Proposal Id #7201 Galaxies &Amp, Clusters

Scientific paper

The shear of faint galaxy images arising from gravitational lensing by foreground massive clusters provides important constraints on the distribution and total amount of mass in the clusters. Furthermore, in a few rare clusters, the lensing models may be sufficiently well-constrained by arcs and multiple images to yield robust redshift estimates for faint galaxies well beyond reach of current spectrographs. Ground- based telescopes suffer systematic degradations which reduce the detected shear by factors of ~2-3. Detecting the unadulterated shear pattern with HST will yield an absolute calibration of ground-based results and confirm or otherwise the high cluster mass/light ratios obtained so far. We propose deep WFPC-2 imaging of two of the most well-studied clusters for this purpose. Both have the rare distinction of having lensed features of known redshift which strongly constrain the absolute mass. When calibrated with the HST shear, not only will more reliable mass maps result, but the lensing equations can be inverted to provide statistical distances for large numbers of very faint field galaxies. These will be invaluable in studies of galaxy evolution and for subsequent lensing applications in other clusters.

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