Joint growth rate measurements from redshift-space distortions and peculiar velocities in the 6dF Galaxy Survey

Abstract

We present a new model for the cross-covariance between galaxy redshift-space distortions and peculiar velocities. We combine this with the auto-covariance models of both probes in a fully self-consistent, maximum-likelihood method, allowing us to extract enhanced cosmological parameter constraints. When applying our method to the 6-degree Field Galaxy Survey (6dFGS), our constraint on the growth rate of structure is $f{\sigma }_8=0.384\pm 0.052(\mathrm{stat})\pm 0.061(\mathrm{sys})$ and our constraint for the redshift-space distortion parameter is $\beta =0.289_{-0.043}^{+0.044}(\mathrm{stat})\pm 0.049(\mathrm{sys})$. We find that the statistical uncertainty for the growth rate of structure is reduced by 64% when using the complete covariance model compared to the redshift-space distortion auto-covariance model and 50% when compared to using the peculiar velocity auto-covariance model. Our constraints are consistent with those from the literature on combining multiple tracers of large-scale structure, as well as those from other 6dFGS analyses. Our measurement is also consistent with the standard cosmological model.

21 pages, 12 figures, 5 tables

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Cited by in corpus (24)

• Joint analysis of 6dFGS and SDSS peculiar velocities for the growth rate of cosmic structure and tests of gravity
• The Sloan Digital Sky Survey Peculiar Velocity Catalogue
• Constrained realizations of 2MRS density and peculiar velocity fields: growth rate and local flow
• Peculiar-velocity cosmology with Types Ia and II supernovae
• Target Selection for the DESI Peculiar Velocity Survey
• The Local Distance Network: a community consensus report on the measurement of the Hubble constant at 1% precision
• Peculiar velocities in the local Universe: comparison of different models and the implications for $H_0$ and dark matter
• A local measurement of the growth rate from peculiar velocities and galaxy clustering correlations in the 6dF Galaxy Survey
• DESI Peculiar Velocity Survey -- Fundamental Plane
• 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 the growth rate by combining multiple future surveys
• Growth-rate measurement with type-Ia supernovae using ZTF survey simulations
• Assessing the accuracy of cosmological parameters estimated from velocity -- density comparisons via simulations
• Exploring the Redshift-Space Peculiar Velocity Field and its Power Spectrum
• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
• Probing gravity with redshift-space distortions: effects of tracer bias and sample selection
• Forecast for growth-rate measurement using peculiar velocities from LSST supernovae
• Constraining modified gravity scenarios with the 6dFGS and SDSS galaxy peculiar velocity datasets
• Generalized framework for likelihood-based field-level inference of growth rate from velocity and density fields
• Breaking the ${\tau }_{\mathrm{T}}-f$ degeneracy of the kinetic Sunyaev Zel'dovich cosmology in redshift space
• The Velocity Field Olympics: Assessing velocity field reconstructions with direct distance tracers
• Constraining the growth rate on linear scales by combining SKAO and DESI surveys
• $S_8$ from peculiar velocities: agreement with Planck for Tully--Fisher and supernovae, tension for the fundamental plane