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Title:
A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Results and Cosmological Implications
Authors:
Kashlinsky, A.; Atrio-Barandela, F.; Kocevski, D.; Ebeling, H.
Affiliation:
AA(SSAI and Observational Cosmology Laboratory, Code 665, Goddard Space Flight Center, Greenbelt, MD 20771; .), AB(Fisica Teorica, University of Salamanca, 37008 Salamanca, Spain.), AC(Department of Physics, University of California, 1 Shields Avenue, Davis, CA 95616.), AD(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.)
Publication:
The Astrophysical Journal, Volume 686, Issue 2, pp. L49-L52. (ApJL Homepage)
Publication Date:
10/2008
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Observations, Cosmology: Early Universe, Cosmology: Large-Scale Structure of Universe
DOI:
10.1086/592947
Bibliographic Code:
2008ApJ...686L..49K

Abstract

Peculiar velocities of clusters of galaxies can be measured by studying the fluctuations in the cosmic microwave background (CMB) generated by the scattering of the microwave photons by the hot X-ray-emitting gas inside clusters. While for individual clusters such measurements result in large errors, a large statistical sample of clusters allows one to study cumulative quantities dominated by the overall bulk flow of the sample with the statistical errors integrating down. We present results from such a measurement using the largest all-sky X-ray cluster catalog combined to date and the 3 yr WMAP CMB data. We find a strong and coherent bulk flow on scales out to at least >~300 h-1 Mpc, the limit of our catalog. This flow is difficult to explain by gravitational evolution within the framework of the concordance ΛCDM model and may be indicative of the tilt exerted across the entire current horizon by far-away pre-inflationary inhomogeneities.
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