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Mass calibration uncertainty is the largest systematic effect for usingclusters of galaxies to constrain cosmological parameters. We present weaklensing mass measurements from the Canada-France-Hawaii Telescope Stripe 82Survey for galaxy clusters selected through their high signal-to-noise thermalSunyaev-Zeldovich (tSZ) signal measured with the Atacama Cosmology Telescope(ACT). For a sample of 9 ACT clusters with a tSZ signal-to-noise greater thanfive the average weak lensing mass is$\left(4.8\pm0.8\right)\,\times10^{14}\,\mathrm{M}_\odot$, consistent with thetSZ mass estimate of $\left(4.70\pm1.0\right)\,\times10^{14}\,\mathrm{M}_\odot$which assumes a universal pressure profile for the cluster gas. Our results areconsistent with previous weak-lensing measurements of tSZ-detected clustersfrom the Planck satellite. When comparing our results, we estimate theEddington bias correction for the sample intersection of Planck andweak-lensing clusters which was previously excluded.

journal of cosmology and astroparticle physics

Weak-Lensing Mass Calibration of the Atacama Cosmology Telescope  Equatorial Sunyaev-Zeldovich Cluster Sample with the Canada-France-Hawaii  Telescope Stripe 82 Survey