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We use microwave temperature maps from two seasons of data from the AtacamaCosmology Telescope (ACTPol) at 146 GHz, together with the Constant Mass CMASSgalaxy sample from the Baryon Oscillation Spectroscopic Survey to measure thekinematic Sunyaev-Ze\v{l}dovich (kSZ) effect over the redshift range z = 0.4 -0.7. We use galaxy positions and the continuity equation to obtain areconstruction of the line-of-sight velocity field. We stack the cosmicmicrowave background temperature at the location of each halo, weighted by thecorresponding reconstructed velocity. The resulting best fit kSZ model ispreferred over the no-kSZ hypothesis at 3.3sigma and 2.9sigma for twoindependent velocity reconstruction methods, using 25,537 galaxies over 660square degrees. The effect of foregrounds that are uncorrelated with the galaxyvelocities is expected to be well below our signal, and residual thermalSunyaev-Ze\v{l}dovich contamination is controlled by masking the most massiveclusters. Finally, we discuss the systematics involved in converting ourmeasurement of the kSZ amplitude into the mean free electron fraction of thehalos in our sample.

Evidence for the kinematic Sunyaev-Ze\v{l}dovich effect with ACTPol and velocity reconstruction from BOSS