An estimation of the Local growth rate from Cosmicflows-3 peculiar velocities

Abstract

This article explores three usual estimators, noted as $v_{12}$ of the pairwise velocity, ${\psi }_1$ and ${\psi }_2$ of the observed two-point galaxy peculiar velocity correlation functions. These estimators are tested on mock samples of {\it Cosmicflows-3} dataset \citep{Tully:2016aa} , derived from a numerical cosmological simulation, and also on a number of constrained realizations of this dataset. Observational measurements errors and cosmic variance are taken into consideration in the study. The result is a local measurement of $f{\sigma }_8=0.43{\left(\pm 0.03\right)}_{\mathrm{obs}}{\left(\pm 0.11\right)}_{\mathrm{cosmic}}$ out to $z=0.05$, in support of a $\Lambda$CDM cosmology.

9 pages, 7 figures, submitted since Feb 9 2018 to MNRAS, currently under fourth revision

References in corpus (6)

• Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field
• Near-Infrared and Optical Luminosity Functions from the 6dF Galaxy Survey
• The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum
• An Unbiased Estimator of Peculiar Velocity with Gaussian Distributed Errors for Precision Cosmology
• Improving constraints on the growth rate of structure by modelling the density-velocity cross-correlation in the 6dF Galaxy Survey
• Not a Copernican observer: biased peculiar velocity statistics in the local Universe

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• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
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• Testing Bayesian reconstruction methods from peculiar velocities
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• Generalized framework for likelihood-based field-level inference of growth rate from velocity and density fields
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• Improved Methods for Estimating Peculiar Velocity Correlation Functions Using Volume Weighting