A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Results and Cosmological Implications

  title={A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Results and Cosmological Implications},
  author={A. Kashlinsky and Fernando Atrio-Barandela and Dale D. Kocevski and Harald Ebeling},
  journal={The Astrophysical Journal},
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… Expand

Figures from this paper

A measurement of large-scale peculiar velocities of clusters of galaxies: technical details
This paper presents detailed analysis of large-scale peculiar motions derived from a sample of ~700 X-ray clusters and cosmic microwave background (CMB) data obtained with WMAP. We use the kinematicExpand
A New Measurement of the Bulk Flow of X-Ray Luminous Clusters of Galaxies
We present new measurements of the large-scale bulk flows of galaxy clusters based on five-year WMAP data and a significantly expanded X-ray cluster catalog. Our method probes the flow viaExpand
Planck intermediate results - XIII. Constraints on peculiar velocities
Using Planck data combined with the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we address the study of peculiar motions by searching for evidence of the kinetic Sunyaev-ZeldovichExpand
Measuring coherent motions in the universe
We present new measurements of the coherent motion of galaxies based on observations of the large-scale redshift-space distortions seen in the two-dimensional two-point correlation function ofExpand
Evidence for anisotropy of cosmic acceleration
Observations reveal a “bulk flow” in the local Universe which is faster and extends to much larger scales than are expected around a typical observer in the standard ΛCDM cosmology. This is expectedExpand
Peculiar Velocities and Large Scale Flows as Probes of Gravity, ΛCDM and the Growth of Structure over Cosmic Time
Peculiar velocities are possibly the most powerful probes of very large-scale mass density fluctuations in the nearby Universe. When coupled with a density field they also can constrain the growthExpand
We generate the peculiar velocity field for the Two Micron All-Sky Redshift Survey (2MRS) catalog using an orbit-reconstruction algorithm. The reconstructed velocities of individual objects in 2MRSExpand
Observations and inhomogeneity in cosmology
We interpret distance measurements from nearby galaxies, type Ia supernovae, and gamma-ray bursts in the light of a cosmological model that incorporates a spatial averaging technique to account forExpand
Cosmic flows in the nearby universe from Type Ia supernovae
Peculiar velocities are one of the only probes of very large scale mass density fluctuations in the nearby Universe. We present new ‘minimal variance’ bulk flow measurements based upon the ‘FirstExpand
High redshift radio galaxies and divergence from the CMB dipole
Previous studies have found our velocity in the rest frame of radio galaxies at high redshift to be much larger than that inferred from the dipole anisotropy of the cosmic microwave background. WeExpand


Measuring the Mach Number of the Universe via the Sunyaev-Zeldovich Effect
We introduce a new statistic to measure more accurately the cosmic sound speed of clusters of galaxies at different redshifts. This statistic is evaluated by cross-correlating cosmic microwaveExpand
Measuring Cosmological Bulk Flows via the Kinematic Sunyaev-Zeldovich Effect in the Upcoming Cosmic Microwave Background Maps.
A new method for measuring the possible large-scale bulk flows in the universe from the cosmic microwave background (CMB) maps from the upcoming missions of the Microwave Anistropy Probe (MAP) and Planck is proposed and it is found that at the 95% confidence level, the bulk flows can be probed down to the amplitude of less than 200 km s(-1) with the MAP data and down to only approximately 30 km s-1 with the Planck mission. Expand
X‐ray properties of galaxy clusters and groups from a cosmological hydrodynamical simulation
We present results on the X-ray properties of clusters and groups of galaxies, extracted from a large cosmological hydrodynamical simulation. We used the TREE+SPH code GADGET to simulate aExpand
Measurement of the Electron-Pressure Profile of Galaxy Clusters in 3 Year Wilkinson Microwave Anisotropy Probe (WMAP) Data
Using 3 year WMAP data at the locations of ~700 X-ray-selected clusters, we have detected the amplitude of the thermal Sunyaev-Zeldovich (TSZ) effect at the 15 ? level, the highest statisticalExpand
Temperature profiles of a representative sample of nearby X-ray galaxy clusters
Context. A study of the structural and scaling properties of the temperature distribution of the hot, X-ray emitting intra-cluster medium of galaxy clusters, and its dependence on dynamical state,Expand
A Systematic X-Ray Search for Clusters of Galaxies behind the Milky Way*
We report on the design and status of the Clusters in the Zone of Avoidance (CIZA) project, the first systematic X-ray search for clusters of galaxies behind the Milky Way. We demonstrate that anExpand
The Structure of cold dark matter halos
High resolution N-body simulations show that the density profiles of dark matter halos formed in the standard CDM cosmogony can be fit accurately by scaling a simple “universal” profile. RegardlessExpand
Interpreting New Data on Large-Scale Bulk Flows
We study the implications of a recent estimate of the bulk flow of a sample of galaxies containing Type Ia supernovae (SN Ia's) by Riess, Press, & Kirshner. We find that their results are quiteExpand
Will COBE challenge the inflationary paradigm - Cosmic microwave background anisotropies versus large-scale streaming motions revisited
The relation between cosmic microwave background (CMB) anisotropies and large-scale galaxy streaming motions is examined within the framework of inflationary cosmology. The minimal Sachs and WolfeExpand
Mapping Large-Scale Structures Behind the Galactic Plane: The Second CIZA Subsample
We present the latest results of the Clusters in the Zone of Avoidance (CIZA) survey, which is mapping the large-scale matter distribution behind the Milky Way by performing the first systematicExpand