First measurement of the cross-correlation of CMB lensing and galaxy lensing
/ Authors
N. Hand, A. Leauthaud, Sudeep Das, B. Sherwin, G. Addison, J. Bond, E. Calabrese, A. Charbonnier, M. Devlin, J. Dunkley
and 26 more authors
T. Erben, A. Hajian, M. Halpern, J. Harnois-D'eraps, C. Heymans, H. Hildebrandt, A. Hincks, J. Kneib, A. Kosowsky, M. Makler, L. Miller, K. Moodley, B. Moraes, M. Niemack, L. Page, B. Partridge, N. Sehgal, H. Shan, J. Sievers, D. Spergel, S. Staggs, E. Switzer, James E. Taylor, L. Waerbeke, C. Welker, Edward J. Wollack
/ 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.
Journal: Physical Review D