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

Nick Hand , Alexie Leauthaud , Sudeep Das , Blake D. Sherwin , Graeme E. Addison , J. Richard Bond , Erminia Calabrese , Ald\'ee Charbonnier

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Mark J. Devlin Joanna Dunkley Thomas Erben Amir Hajian Mark Halpern Joachim Harnois-D\'eraps Catherine Heymans Hendrik Hildebrandt Adam D. Hincks Jean-Paul Kneib Arthur Kosowsky Martin Makler Lance Miller Kavilan Moodley Bruno Moraes Michael D. Niemack Lyman A. Page Bruce Partridge Neelima Sehgal Huanyuan Shan Jonathan L. Sievers David N. Spergel Suzanne T. Staggs Eric R. Switzer James E. Taylor Ludovic Van Waerbeke Charlotte Welker Edward J. Wollack

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classification 🌌 astro-ph.CO

keywords lensingmeasurementconvergencecross-correlationdatafirstgalaxymaps

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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 4.2{\sigma}, 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.

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

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