A MEASUREMENT OF LARGE-SCALE PECULIAR VELOCITIES OF CLUSTERS OF GALAXIES: RESULTS AND COSMOLOGICAL IMPLICATIONS

被引:226
作者
Kashlinsky, A. [1 ,2 ]
Atrio-Barandela, F. [3 ]
Kocevski, D. [4 ]
Ebeling, H. [5 ]
机构
[1] NASA, Goddard Space Flight Ctr, SSAI, Greenbelt, MD 20771 USA
[2] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 USA
[3] Univ Salamanca, E-37008 Salamanca, Spain
[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
关键词
cosmic microwave background; cosmology: observations; early universe; large-scale structure of universe;
D O I
10.1086/592947
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 greater than or similar to 300 h(-1) Mpc, the limit of our catalog. This flow is difficult to explain by gravitational evolution within the framework of the concordance Lambda CDM model and may be indicative of the tilt exerted across the entire current horizon by far-away pre-inflationary inhomogeneities.
引用
收藏
页码:L49 / L52
页数:4
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