Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect

N. Hand , Graeme E. Addison , E. Aubourg (1) , Nick Battaglia , Elia S. Battistelli , Dmitry Bizyaev , J. Richard Bond , Howard Brewington , Jon Brinkmann , Benjamin R. Brown , Sudeep Das , Kyle S. Dawson , Mark J. Devlin , Joanna Dunkley , Rolando Dunner , Daniel J. Eisenstein , Joseph W. Fowler , Megan B. Gralla , Amir Hajian , Mark Halpern , Matt Hilton , Adam D. Hincks , Renée Hlozek , John P. Hughes , Leopoldo Infante , Kent D. Irwin , Arthur Kosowsky , Yen-Ting Lin , Elena Malanushenko , Viktor Malanushenko , Tobias A. Marriage , Danica Marsden , Felipe Menanteau , Kavilan Moodley , Michael D. Niemack , Michael R. Nolta , Daniel Oravetz , Lyman A. Page , Nathalie Palanque-Delabrouille , Kaike Pan , Erik D. Reese , David J. Schlegel , Donald P. Schneider , Neelima Sehgal , Alaina Shelden , Jon Sievers , Cristóbal Sifón , Audrey Simmons , Stephanie Snedden , David N. Spergel , Suzanne T. Staggs , Daniel S. Swetz , Eric R. Switzer , Hy Trac , Benjamin A. Weaver , Edward J. Wollack , Christophe Yeche , Caroline Zunckel

1 APC (UMR_7164) - AstroParticule et Cosmologie

Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time present strong evidence for motions of galaxy clusters and groups via microwave background temperature distortions due to the kinematic Sunyaev-Zel'dovich effect. Galaxy clusters are identified by their constituent luminous galaxies observed by the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. We measure the mean pairwise momentum of clusters, with a probability of the signal being due to random errors of 0.002, and the signal is consistent with the growth of cosmic structure in the standard model of cosmology.

Mots clés: redshifts; radial velocities; spatial distribution of galaxies; Galaxy clusters; Background radiations; Observational cosmology; Distances

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

N. Hand, Graeme E. Addison, E. Aubourg, Nick Battaglia, Elia S. Battistelli, et al.. Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect. Physical Review Letters, 2012, 109, pp.041101. ⟨10.1103/PHYSREVLETT.109.041101⟩. ⟨hal-00736934⟩