THE ATACAMA COSMOLOGY TELESCOPE: DYNAMICAL MASSES AND SCALING RELATIONS FOR A SAMPLE OF MASSIVE SUNYAEV-ZEL'DOVICH EFFECT SELECTED GALAXY CLUSTERS

We present the first dynamical mass estimates and scaling relations for a sample of Sunyaev-Zel'dovich effect (SZE) selected galaxy clusters. The sample consists of 16 massive clusters detected with the Atacama Cosmology Telescope (ACT) over a 455 deg super(2) area of the southern sky. The dynamical masses M sub(200)c of the clusters have been calculated using simulation-based scaling relations between velocity dispersion and mass. These masses are compared to the ACT SZE properties of the sample, specifically, the match-filtered central SZE amplitude y sub(0), the central Compton parameter y sub(0), and the integrated Compton signal Y sub(200)c, which we use to derive SZE-mass scaling relations. All SZE estimators correlate with dynamical mass with low intrinsic scatter ([lap]20%), in agreement with numerical simulations. There are hints that disturbed systems might bias the scaling relations, but given the current sample sizes, these differences are not significant; further studies including more clusters are required to assess the impact of these clusters on the scaling relations.