Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6482f&link_type=abstract
HST Proposal ID #6482
Computer Science
Hst Proposal Id #6482 Cosmology
Scientific paper
Some relatively bright QSOs have long been suspected to be gravitationally magnified. We have found along the line of sight towards some of them a coherent shear pattern of faint distant galaxies. Moreover there appear to be overdensities of galaxies concentric with the shear patterns which are probably responsible for the weak lensing effect and the QSO magnifications. These concentrations seem to have sizes and masses comparable to those of groups or clusters of galaxies. Although the gravitational shear of the galaxies is easily seen from the ground, an accurate measurement of the mass and the M/L ratio of the concentration require observations with the WFPC2. , We have selected 3 QSOs from our ESO-CFHT survey for which a coherent shear pattern has been unambiguously detected. The proposed HST observations will determine the amount of dark matter in this new class of lensing masses first selected from their weak lensing effect.
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