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-year
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 LCDM
model and may be indicative of the tilt exerted across the entire current
horizon by far-away pre-inflationary inhomogeneities.
Description
A measurement of large-scale peculiar velocities of clusters of
galaxies: results and cosmological implications
%0 Generic
%1 Kashlinsky2008
%A Kashlinsky, A.
%A Atrio-Barandela, F.
%A Kocevski, D.
%A Ebeling, H.
%D 2008
%K large measurement peculiar scale velocities
%T A measurement of large-scale peculiar velocities of clusters of
galaxies: results and cosmological implications
%U http://arxiv.org/abs/0809.3734
%X 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-year
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 LCDM
model and may be indicative of the tilt exerted across the entire current
horizon by far-away pre-inflationary inhomogeneities.
@misc{Kashlinsky2008,
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-year
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 LCDM
model and may be indicative of the tilt exerted across the entire current
horizon by far-away pre-inflationary inhomogeneities.
},
added-at = {2011-07-09T15:36:02.000+0200},
author = {Kashlinsky, A. and Atrio-Barandela, F. and Kocevski, D. and Ebeling, H.},
biburl = {https://www.bibsonomy.org/bibtex/270ac5acb89f63e6cc682cd6781345031/aquelle},
description = {A measurement of large-scale peculiar velocities of clusters of
galaxies: results and cosmological implications},
interhash = {442bb2fe373264125ccae8525907cc5a},
intrahash = {70ac5acb89f63e6cc682cd6781345031},
keywords = {large measurement peculiar scale velocities},
note = {cite arxiv:0809.3734
Comment: Ap.J. (Letters), in press. 20 Oct issue (Vol. 686)},
timestamp = {2011-07-10T13:15:56.000+0200},
title = {A measurement of large-scale peculiar velocities of clusters of
galaxies: results and cosmological implications},
url = {http://arxiv.org/abs/0809.3734},
year = 2008
}