A joint analysis of data from the Atacama Cosmology Telescope and the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) has yielded the first robust detection of the kinetic Sunyaev-Zel’dovich effect, first predicted forty years ago. This effect is due to the motions of galaxy clusters with respect to the cosmic microwave background, and its imprint will unveil new information about dark energy, dark matter, and the formation of the galaxy clusters—the largest bound structures in the Universe.

For more, see the joint press releases from the ACT and SDSS-III collaborations:

http://www.princeton.edu/main/news/archive/S33/21/69O40/
http://www.sdss3.org/press/20120319.ksz.php

The paper was posted to the arXiv preprint server today as

“Detection of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel’dovich Effect”
http://arxiv.org/abs/1203.4219