Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540804h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #408.04; Bulletin of the American Astronomical Society, Vol. 42, p.232
Other
Scientific paper
We present results from weak galaxy - galaxy lensing that demonstrate the importance of considering multiple deflections when interpreting anisotropic weak shear results. In particular, we show that multiple deflections can introduce systematic depression of γ+ - the anisotropic shear with respect to the major axis of the lens, and a corresponding amplification of γ-. Such systematics can lead to reduced estimates of the degree of flattening of galaxy dark matter halos, or even the conclusion that dark matter halos are anti-aligned with the light.
We also report the results of isotropic and anisotropic galaxy-galaxy lensing. We make a modest (95%) detection of flattened dark matter halos aligned with the light and that an NFW type density profile is preferred over an isothermal density profile.
This work has been supported by the National Science Foundation
(AST-0406844, AST-0708468).
Brainerd Tereasa G.
Howell Paul
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