Evidence of Lensing of the Cosmic Microwave Background by Dark Matter Halos

We present evidence 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.

Comments: 9 pages, 3 figures, accepted by PRL, author list corrected

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2017Mar
Affiliations: 1KIPAC Stanford/SLAC, 2KICP U. of Chicago, 3KIPAC Stanford/SLAC, 4KICP U. of Chicago, 5U. of Bristol, 6U. of Arizona, 7U. of Bristol, 8U. of Victoria, 9U. of Bonn, 10CEA-Saclay

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