AAS 205th Meeting, 9-13 January 2005
Session 147 Groups and Clusters of Galaxies
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

## [147.10] Cluster Peculiar Velocities through the Kinetic Sunyaev-Zeldovich Effect

P. M. Motl (Louisiana State University), J. O. Burns (University of Colorado, Boulder), M. L. Norman (University of California, San Diego)

Upcoming observations of the kinetic Sunyyaev-Zeldovich effect (KSZE) offer the possibility to measure the line of sight velocity of galaxy clusters relative to the cosmic miccrowave background reference frame. These data will enable a variety of cosmological tests including the estimation of the cosmic density field itself (in addition to the perturbations of the density). However, simulated clusters of galaxies typically have internal flows with speeds that are comparable to the peculiar velocity of the clusters. Assumng an angular resolution typical for interferometers and bolometer arrays that are currently in use or under devlopment, we construct maps of both the thermal and kinetic Sunyaev-Zeldovich effects for large samples of numerical clusters of galaxies (containing approximately 100 clusters with 1 \times 1014 \; M\odot \leq M200 \leq 2 \times 1015 \; M\odot at the present eepoch). The synthetic maps are used to construct estimates of the cluster peculiar velocity; the internal cluster flows result in a irreduccible dispersion in the cluster peculiar velocity measurements.