Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8746b&link_type=abstract
HST Proposal ID #8746
Computer Science
Hst Proposal Id #8746 Cosmology
Scientific paper
Deep archival imaging data will be used to investigate the degree to which the dark matter halos of field galaxies deviate from pure spherical symmetry. The technique that will be used is a measurement of the mean gravitational lensing shear induced by foreground galaxies in the images of background galaxies, a phenomenon known as galaxy--galaxy lensing. To date, all investigations of galaxy--galaxy lensing have focused on a detection of the signal in via a circular average about the lens center and have implicitly assumed that galaxy halos are spherically symmetric. However, there is mounting observational evidence that dark matter halos may be substantially flattened, in which case their projected surface mass densities will deviate from circular symmetry. As a result, the gravitational lensing shear pattern that will be induced by these galaxies will not be circularly symmetric about the lens center. In this investigation the shear induced by galaxy--galaxy lensing will be computed along direction vectors defined by the major and minor axes of the images of the lenses, and the degree to which the shear pattern deviates from circular symmetry will be quantified. This will be used in conjunction with Monte Carlo simulations of galaxy--galaxy lensing by flattened halos in order to place constraints on the overall flattening of the dark matter halos of field galaxies.
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