Constraining Galaxy Halo Shapes with Weak Lensing

Details Constraining Galaxy Halo Shapes with Weak Lensing Constraining Galaxy Halo Shapes with Weak Lensing

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.7503w&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #75.03; Bulletin of the American Astronomical Society, Vol. 33, p.1418

Astronomy and Astrophysics

Astronomy

Scientific paper

I examine a new application of weak gravitational lensing by galaxies to constrain the mean projected ellipticity of dark matter galaxy halos. I run detailed Monte Carlo simulations to determine the feasibility of detecting flattened halos by the anisotropic shear signal they induce about their centers. For a deep, ground-based data set with realistic noise properties, 20-30 square degrees of sky are necessary for a 4 sigma detection. Foreground mass concentrations induce correlations in the lens and source image shapes, which suppress the anisotropy signal. I derive, in terms of observable quantities, a correction factor to remove the effects of lens-source correlations, and demonstrate that it recovers the true signal to within errors.

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