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First measurement of the cross-correlation of CMB lensing and galaxy lensing

Hand, Nick, Leauthaud, Alexie, Das, Sudeep, Sherwin, Blake D., Addison, Graeme E., Bond, J. Richard, Calabrese, Erminia, Charbonnier, Aldée, Devlin, Mark J., Dunkley, Joanna, Erben, Thomas, Hajian, Amir, Halpern, Mark, Harnois-Déraps, Joachim, Heymans, Catherine, Hildebrandt, Hendrik, Hincks, Adam D., Kneib, Jean-Paul, Kosowsky, Arthur, Makler, Martin, Miller, Lance, Moodley, Kavilan, Moraes, Bruno, Niemack, Michael D., Page, Lyman A., Partridge, Bruce, Sehgal, Neelima, Shan, Huanyuan, Sievers, Jonathan L., Spergel, David N., Staggs, Suzanne T., Switzer, Eric R., Taylor, James E., Van Waerbeke, Ludovic, Welker, Charlotte and Wollack, Edward J. 2015. First measurement of the cross-correlation of CMB lensing and galaxy lensing. Physical Review D 91 (6) , 062001. 10.1103/PhysRevD.91.062001

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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 4.2σ, 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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 15507998
Date of First Compliant Deposit: 7 September 2017
Date of Acceptance: 2 March 2015
Last Modified: 15 Mar 2019 15:33
URI: http://orca.cf.ac.uk/id/eprint/104439

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