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American Physical Society, Physical Review D, 6(91)

DOI: 10.1103/physrevd.91.062001

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First Measurement of the Cross-Correlation of CMB Lensing and Galaxy Lensing

Journal article published in 2015 by J. Richard Bond, Nick Hand, Alexie Leauthaud, Sudeep Das, Blake D. Sherwin, Aldée Charbonnier, Graeme E. Addison, Mark J. Devlin, J. Richard Bond, Joanna Dunkley, Erminia Calabrese, Thomas Erben, Amir Hajian, Mark Halpern, Joachim Harnois-Déraps and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We measure the cross-correlation of cosmic microwave background (CMB) 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 4.2 sigma, which corresponds to a 12% constraint on the amplitude of density fluctuations at redshifts similar to 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.