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

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arxiv 1411.7999 v3 pith:U3756CY6 submitted 2014-11-28 astro-ph.CO

Mathew Madhavacheril , Neelima Sehgal , Rupert Allison , Nick Battaglia , J Richard Bond , Erminia Calabrese , Jerod Caligiuri , Kevin Coughlin
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Devin Crichton Rahul Datta Mark J. Devlin Joanna Dunkley Rolando Dünner Kevin Fogarty Emily Grace Amir Hajian 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
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keywords lensingdarkmatterbackgroundhalosmicrowavecosmicevidence
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abstract

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.

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