How accurately can the SZ effect measure peculiar cluster velocities and bulk flows?

Abstract

The Sunyaev-Zel'dovich effect is a powerful tool for cosmology that can be used to measure the radial peculiar velocities of galaxy clusters, and thus to test, and constrain, theories of structure formation and evolution. This requires, in principle, an accurate measurement of the effect, a good separation between the Sunyaev-Zel'dovich components, and a good understanding of the sources contributing to the signal and their effect on the measured velocity. In this study, we evaluate the error in the individual radial peculiar velocities determined with Sunyaev-Zel'dovich measurements. We estimate, for three cosmological models, the errors induced by the major contributing signals (primary Cosmic Microwave Background anisotropies, Sunyaev-Zel'dovich effect due to the background cluster population, residuals from component separation and instrumental noise). We generalise our results to estimate the error in the bulk velocity on large scales. In this context, we investigate the limitation due to the Sunyaev-Zel'dovich source (or spatial) confusion in a Planck-like instrumental configuration. Finally, we propose a strategy based on the future all-sky Sunyaev-Zel'dovich survey, that will be provided by the Planck mission, to measure accurately the bulk velocities on large scales up to redshift 1, or more.

24 pages, 8 figures, revised version of an article submitted to Astronomy and Astrophysics (in referee style)

Cited by in corpus (42)

• Observational Tests of Modified Gravity
• CMB and SZ effect separation with Constrained Internal Linear Combinations
• Dark Energy Constraints from Galaxy Cluster Peculiar Velocities
• Effect of Internal Flows on Sunyaev-Zeldovich Measurements of Cluster Peculiar Velocities
• Cosmology with kSZ: breaking the optical depth degeneracy with Fast Radio Bursts
• Effects of sub-mm and radio point sources on the recovery of Sunyaev-Zeldovich galaxy cluster parameters
• Correlation properties of the kinematic Sunyaev-Zel'dovich effect and implications for Dark Energy
• Constraints on the Evolution of the Primordial Magnetic Field from the Small-Scale Cosmic Microwave Background Angular Anisotropy
• Planck intermediate results. XIII. Constraints on peculiar velocities
• Detection and discrimination of cosmological non-Gaussian signatures by multi-scale methods
• Measuring cluster peculiar velocities with the Sunyaev-Zeldovich effects: scaling relations and systematics
• Cosmological non-Gaussian Signature Detection: Comparing Performance of Different Statistical Tests
• Constraints on the optical depth of galaxy groups and clusters
• Constraining the Primordial Magnetic Field from Cosmic Microwave Background Anisotropies at Higher Multipoles
• Simulations of the Pairwise Kinematic Sunyaev-Zel'dovich Signal
• A new method of measuring the cluster peculiar velocity power spectrum
• Modeling peculiar velocities of dark matter halos
• Trouble for cluster parameter estimation from blind SZ surveys?
• Determining Tangential Peculiar Velocities of Clusters of Galaxies using Gravitational Lensing
• Cosmology with the pairwise kinematic SZ effect: Calibration and validation using hydrodynamical simulations
• Constraints on Resonant Particle Production during Inflation from the Matter and CMB Power Spectra
• Kinetic SZ effect and CMB polarization from subsonic bulk motions of dense gas clouds in galaxy cluster cores
• The impact of relativistic corrections and component separation in the measurement of the SZ effect and on the small angular scale non-Gaussianity of the CMB
• The Santa Fe Light Cone Simulation Project: II. The Prospects for Direct Detection of the WHIM with SZE Surveys
• Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect
• Superclusters with thermal SZ effect surveys
• Testing the tensor-vector-scalar Theory with the latest cosmological observations
• Extraction of cluster parameters with future Sunyaev-Zel'dovich observations
• Optimal Moments for the Analysis of Peculiar Velocity Surveys II: Testing
• Planck intermediate results. LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect
• The rms peculiar velocity of galaxy clusters for different cluster masses and radii
• Separating the kinetic SZ effect from primary CMB fluctuations
• Pairwise kSZ signal extraction efficacy and optical depth estimation
• A potentially pure test of cosmic geometry: galaxy clusters and the real space Alcock-Paczynski test
• Gravitational Potential Reconstruction from Peculiar Velocity and Weak Lensing Measurements
• The effect of bandpass uncertainties on component separation
• Peculiar Velocity Estimation from Kinetic SZ Effect using Deep Neural Networks
• Using Galaxy Cluster Peculiar Velocities to Constrain Cosmological Parameters
• A CMB Gibbs sampler for localized secondary anisotropies
• kSZ Pairwise Velocity Reconstruction with Machine Learning
• The velocity--shape alignment of clusters and the kinetic Sunyaev--Zeldovich effect
• Cluster optical depth and pairwise velocity estimation using machine learning