Tomographic Weak Gravitational Lensing Magnification with the Deep Lens Survey

Details Tomographic Weak Gravitational Lensing Magnification with the Deep Lens Survey Tomographic Weak Gravitational Lensing Magnification with the Deep Lens Survey

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933606m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #336.06

Astronomy and Astrophysics

Astronomy

Scientific paper

Using half a million galaxies from the Deep Lens Survey, we have measured the gravitational lensing-induced magnification of high redshift (z 4) Lyman Break Galaxies (LBGs) by foreground field galaxies at a S/N > 20, finding a signal consistent with the expected lensing behavior. Using photometric redshifts, we can further divide our foreground galaxies into 8 roughly equal sub-groups covering the redshift range 0.4 < z < 1.2, which spans the expected lensing efficiency peak. After accounting for the evolution in large scale bias, we find that the measured lensing signal for the 8 sub-samples is consistent with the expected tomographic signal in LambdaCDM with a sigma8 given by WMAP CMB data. We find that these results are robust against systematic effects from variations in survey depth, seeing, and extinction as well as cross-contamination between the photometric redshift-selected foreground and LBG samples.

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