Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21831902c&link_type=abstract
American Astronomical Society, AAS Meeting #218, #319.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The cluster Abell 781D offers a unique challenge for weak lensing mass measurements. It is situated in the Deep Lens Survey (DLS) field F2 adjacent to 3 other clusters coincident on the sky that make up Abell 781. One of these clusters (Abell 781A) has a nearly identical redshift, X-ray and dynamical mass to Abell 781D. However, Abell 781A is detected with the expected significance in the weak lensing reconstruction, while the significance of the signal at the location of Abell 781D is conspicuously low. We use imaging from OPTIC on WIYN and archival Suprime imaging of this region to reanalyze the weak lensing mass of this cluster. We use these analyses to rule out systematics from the PSF characterization in the DLS map and to show that the source of the discrepancy between the weak lensing derived mass and the masses derived using other proxies is a real effect that requires careful characterization before weak lensing calibration of mass-observable relationships can be fully trusted.
Cook Richard
Dell'Antonio Ian
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