The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum

Abstract

We present scale-dependent measurements of the normalised growth rate of structure $f{\sigma }_8(k,z=0)$ using only the peculiar motions of galaxies. We use data from the 6-degree Field Galaxy Survey velocity sample (6dFGSv) together with a newly-compiled sample of low-redshift $(z<0.07)$ type Ia supernovae. We constrain the growth rate in a series of $\Delta k\sim 0.03h\mathrm{Mp}{\mathrm{c}}^{-1}$ bins to $\sim 35\%$ precision, including a measurement on scales $>300h^{-1}\mathrm{Mpc}$, which represents one of the largest-scale growth rate measurement to date. We find no evidence for a scale dependence in the growth rate, or any statistically significant variation from the growth rate as predicted by the {\it Planck} cosmology. Bringing all the scales together, we determine the normalised growth rate at $z=0$ to $\sim 15\%$ in a manner {\it independent} of galaxy bias and in excellent agreement with the constraint from the measurements of redshift-space distortions from 6dFGS. We pay particular attention to systematic errors. We point out that the intrinsic scatter present in Fundamental-Plane and Tully-Fisher relations is only Gaussian in logarithmic distance units; wrongly assuming it is Gaussian in linear (velocity) units can bias cosmological constraints. We also analytically marginalise over zero-point errors in distance indicators, validate the accuracy of all our constraints using numerical simulations, and demonstrate how to combine different (correlated) velocity surveys using a matrix `hyper-parameter' analysis. Current and forthcoming peculiar velocity surveys will allow us to understand in detail the growth of structure in the low-redshift universe, providing strong constraints on the nature of dark energy.

23 pages, 14 figures, submitted to MNRAS. v2 is 25 pages, 17 figures, accepted by MNRAS

References in corpus (16)

• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Modified gravity models of dark energy
• Current constraints on the cosmic growth history
• Multi-Point Propagators in Cosmological Gravitational Instability
• Near-Infrared and Optical Luminosity Functions from the 6dF Galaxy Survey
• Modeling scale-dependent bias on the baryonic acoustic scale with the statistics of peaks of Gaussian random fields
• Modelling redshift space distortions in hierarchical cosmologies
• The peculiar velocity field: constraining the tilt of the Universe
• Scale Dependent Galaxy Bias in the SDSS as a function of Luminosity and Colour
• The 6dF Galaxy Survey: Fundamental Plane Data
• Scale-dependent halo bias from scale-dependent growth
• Peculiar Velocities into the Next Generation: Cosmological Parameters From Large Surveys without Bias from Nonlinear Structure
• Constraining Cosmic Expansion and Gravity with Galaxy Redshift Surveys
• Testing Dark Matter Clustering with Redshift Space Distortions

Cited by in corpus (55)

• Challenges for $\Lambda$CDM: An update
• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
• 2MTF VI. Measuring the velocity power spectrum
• Unified galaxy power spectrum measurements from 6dFGS, BOSS, and eBOSS
• Cosmological Forecasts for Combined and Next Generation Peculiar Velocity Surveys
• The Redshift Space Momentum Power Spectrum II: measuring the growth rate from the combined 2MTF and 6dFGSv surveys
• The 6dF Galaxy Survey: Fundamental Plane Data
• The Sloan Digital Sky Survey Peculiar Velocity Catalogue
• Measuring the growth rate of structure with Type IA Supernovae from LSST
• Improving constraints on the growth rate of structure by modelling the density-velocity cross-correlation in the 6dF Galaxy Survey
• An Unbiased Estimator of Peculiar Velocity with Gaussian Distributed Errors for Precision Cosmology
• Constrained realizations of 2MRS density and peculiar velocity fields: growth rate and local flow
• New Gravitational Scales in Cosmological Surveys
• The SAMI Galaxy Survey: stellar population and structural trends across the Fundamental Plane
• Probing bulk flow with nearby SNe Ia data
• Joint growth rate measurements from redshift-space distortions and peculiar velocities in the 6dF Galaxy Survey
• An estimation of the Local growth rate from Cosmicflows-3 peculiar velocities
• The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys
• Update on HI data collection from GBT, Parkes and Arecibo telescopes for the Cosmic Flows project
• Cosmic Growth and Expansion Conjoined
• A local measurement of the growth rate from peculiar velocities and galaxy clustering correlations in the 6dF Galaxy Survey
• $R_{\mathrm{e}}$. I. Understanding galaxy sizes, associated luminosity densities, and the artificial division of the early-type galaxy population
• Complementarity of Peculiar Velocity Surveys and Redshift Space Distortions for Testing Gravity
• Sampling Artifact in Volume Weighted Velocity Measurement.--- II. Detection in simulations and comparison with theoretical modelling
• Probing $f(R)$ cosmology with sterile neutrinos via measurements of scale-dependent growth rate of structure
• Determination of the large scale volume weighted halo velocity bias in simulations
• Using peculiar velocity surveys to constrain the growth rate of structure with the wide-angle effect
• Large-scale motions and growth rate from forward-modelling Tully-Fisher peculiar velocities
• Constraining a late time transition of $G_{\mathrm{eff}}$ using low-z galaxy survey data
• Non-comoving Cosmology
• Growth-rate measurement with type-Ia supernovae using ZTF survey simulations
• Sweeping Horndeski Canvas: New Growth-Rate Parameterization for Modified-Gravity Theories
• 21cmFirstCLASS I. Cosmological tool for $\Lambda$CDM and beyond
• Exploring the Redshift-Space Peculiar Velocity Field and its Power Spectrum
• The 6x2pt method: supernova velocities meet multiple tracers
• Testing Gravity Using Type Ia Supernovae Discovered by Next-Generation Wide-Field Imaging Surveys
• The lure of sirens: joint distance and velocity measurements with third generation detectors
• Cosmic Flow Measurement and Mock Sampling Algorithm of Cosmicflows-4 Tully-Fisher Catalogue
• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
• Cosmological surveys with multi-object spectrographs
• Forecast for growth-rate measurement using peculiar velocities from LSST supernovae
• Gaussianization of peculiar velocities and bulk flow measurement
• Generalized framework for likelihood-based field-level inference of growth rate from velocity and density fields
• Constraining modified gravity scenarios with the 6dFGS and SDSS galaxy peculiar velocity datasets
• HI HOD -- I. The Halo Occupation Distribution of HI Galaxies
• The hyperplane of early-type galaxies: using stellar population properties to increase the precision and accuracy of the fundamental plane as a distance indicator
• Implications of Dynamical Dark Energy in the expansion of the Universe and the Structure Formation
• Modified Gravity and Large Scale Flows, a Review
• Characterising Dark Energy through supernovae
• Anchors no more: Using peculiar velocities to constrain $H_0$ and the primordial Universe without calibrators
• Expansion series of the pairwise velocity generating function and its implications on redshift space distortion modeling
• Improved Methods for Estimating Peculiar Velocity Correlation Functions Using Volume Weighting
• Squared-field cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm intensity mapping
• Prospects for measuring the Doppler magnification dipole with LSST and DESI