First Measurement of the Cross-Correlation of CMB Lensing and Galaxy Lensing
arXiv:1311.6200 · doi:10.1103/PhysRevD.91.062001
Abstract
We measure the cross-correlation of cosmic microwave background lensing convergence maps derived from Atacama Cosmology Telescope data with galaxy lensing convergence maps as measured by the Canada-France-Hawaii Telescope Stripe 82 Survey. The CMB-galaxy lensing cross power spectrum is measured for the first time with a significance of 4.2σ, which corresponds to a 12% constraint on the amplitude of density fluctuations at redshifts ~ 0.9. With upcoming improved lensing data, this novel type of measurement will become a powerful cosmological probe, providing a precise measurement of the mass distribution at intermediate redshifts and serving as a calibrator for systematic biases in weak lensing measurements.
11 pages, 7 figures. Submitted to PRD. Updates to lensing maps and analysis pipeline, with revised results, increased significance
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