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The Atacama Cosmology Telescope: Detection of Lensing of the Cosmic Microwave Background by Dark Matter Halos

Mathew Madhavacheril, Neelima Sehgal, Rupert Allison, Nick Battaglia, J Richard Bond, Erminia Calabrese, Jerod Caliguiri, Kevin Coughlin, Devin Crichton, Rahul Datta, Mark J. Devlin, Joanna Dunkley, Rolando Dünner, Kevin Fogarty, Emily Grace, Matthew Hasselfield, J. Colin Hill, Matt Hilton, Adam D. Hincks, Renée Hlozek, John P. Hughes, Arthur Kosowsky, Thibaut Louis, Marius Lungu, Jeff McMahon, Kavilan Moodley, Charles Munson, Sigurd Naess, Federico Nati, Laura Newburgh, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Benjamin Schmitt, Blake D. Sherwin, Jon Sievers, David N. Spergel, Suzanne T. Staggs, Robert Thornton, Alexander Van Engelen, Jonathan T. Ward, Edward J. Wollack

Published 2014-11-28Version 1

We present a statistical detection of the gravitational lensing of the cosmic microwave background by $10^{13}$ solar mass dark matter halos. Lensing convergence maps from the Atacama Cosmology Telescope Polarimeter (ACTPol) are stacked at the positions of around 12,000 optically-selected CMASS galaxies from the SDSS-III/BOSS survey. The mean lensing signal is consistent with simulated dark matter halo profiles, and is favored over a null signal at 3.2 sigma significance. This result demonstrates the potential of microwave background lensing to probe the dark matter distribution in galaxy group and galaxy cluster halos.

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