Evidence of galaxy cluster motions with the kinematic Sunyaev-Zel'dovich effect.
نویسندگان
چکیده
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.
منابع مشابه
اندازهگیری نمایه عمق نوری خوشههای کهکشانی با استفاده از اثرسونیائف زلدوویچ جنبشی
baryonic matter distribution in the large-scale structures is one of the main questions in cosmology. This distribution can provide valuable information regarding the processes of galaxy formation and evolution. On the other hand, the missing baryon problem is still under debate. One of the most important cosmological structures for studying the rate and the distribution of the baryons is gal...
متن کاملSearching and studying clusters with the SZ effect
I discuss galaxy cluster surveys based on the Sunyaev–Zel'dovich effect and their relevance for cosmological studies. The unique aspects of cluster selection by this method are emphasized and certain issues of surveying are addressed. Finally, I briefly present prospects for upcoming surveys.
متن کاملSZ polarisation as a probe of the intracluster medium
We present high-resolution hydrodynamical simulations of the degree and direction of polarisation imprinted on the CMB by the Sunyaev-Zel'dovich effect in the the line of sight to massive galaxy clusters. We focus on two contributions to the electron rest-frame radiation quadrupole anisotropy in addition to the intrinsic CMB quadrupole that contributes most of the induced CMB polarisation: the ...
متن کاملThe kinematic Sunyaev Zeldovich effect and transverse cluster velocities
The polarization of the CMBR scattered by galaxy clusters in the kinematic Sunyaev Zeldovich effect depends on the transverse velocity of the cluster. This polarizing effect is proportional to the transverse velocity squared, and so weaker that the change in intensity due to the radial motion in the kinematic effect. The value given by Sunyaev and Zeldovich, and which is frequently cited, under...
متن کاملOn the Detectability of Turbulence and Bulk Flows in X-ray Clusters
Cooling flows, cluster mergers and motions of galaxies through the cluster gas with supersonic and sonic velocities must lead to large scale motions of the intracluster medium (ICM). A high–resolution numerical simulation of X-ray cluster formation by Norman and Bryan predicts cluster–wide turbulence with vturb ∼ 300− 600 km/s and eddy scales louter ∼ 100− 500 kpc, the larger numbers being char...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 109 4 شماره
صفحات -
تاریخ انتشار 2012