Cosmological Forecasts for Combined and Next Generation Peculiar Velocity Surveys

Abstract

Peculiar velocity surveys present a very promising route to measuring the growth rate of large-scale structure and its scale dependence. However, individual peculiar velocity surveys suffer from large statistical errors due to the intrinsic scatter in the relations used to infer a galaxy's true distance. In this context we use a Fisher Matrix formalism to investigate the statistical benefits of combining multiple peculiar velocity surveys. We find that for all cases we consider there is a marked improvement on constraints on the linear growth rate $f{\sigma }_8$. For example, the constraining power of only a few peculiar velocity measurements is such that the addition of the 2MASS Tully-Fisher survey (containing only $\sim 2,000$ galaxies) to the full redshift and peculiar velocity samples of the 6-degree Field Galaxy Survey (containing $\sim 110,000$ redshifts and $\sim 9,000$ velocities) can improve growth rate constraints by $\sim 20\%$. Furthermore, the combination of the future TAIPAN and WALLABY+WNSHS surveys has the potential to reach a $\sim 3\%$ error on $f{\sigma }_8$, which will place tight limits on possible extensions to General Relativity. We then turn to look at potential systematics in growth rate measurements that can arise due to incorrect calibration of the peculiar velocity zero-point and from scale-dependent spatial and velocity bias. For next generation surveys, we find that neglecting velocity bias in particular has the potential to bias constraints on the growth rate by over $5\sigma$, but that an offset in the zero-point has negligible impact on the velocity power spectrum.

24 pages, 11 figures, 7 tables. Accepted for publication in MNRAS

References in corpus (26)

• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Nonlinear Evolution of Baryon Acoustic Oscillations
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Measuring primordial non-gaussianity without cosmic variance
• Gravity and Large-Scale Non-local Bias
• The Clustering of the SDSS Main Galaxy Sample II: Mock galaxy catalogues and a measurement of the growth of structure from Redshift Space Distortions at $z=0.15$
• The Scale Dependence of Halo and Galaxy Bias: Effects in Real Space
• A critical look at cosmological perturbation theory techniques
• Understanding higher-order nonlocal halo bias at large scales by combining the power spectrum with the bispectrum
• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• Optimal Surveys for Weak Lensing Tomography
• Modeling scale-dependent bias on the baryonic acoustic scale with the statistics of peaks of Gaussian random fields
• The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum
• SFI++ II: A New I-band Tully-Fisher Catalog, Derivation of Peculiar Velocities and Dataset Properties
• Baryon acoustic signature in the clustering of density maxima
• The Clustering Characteristics of HI-Selected Galaxies from the 40% ALFALFA Survey
• The 6dF Galaxy Survey: Fundamental Plane Data
• Fisher Matrices and Confidence Ellipses: A Quick-Start Guide and Software
• Theoretical and observational constraints on the HI intensity power spectrum
• 2MTF IV. A bulk flow measurement of the local Universe
• Large scale structure in the HI Parkes All-Sky Survey: Filling the Voids with HI galaxies?
• 2MTF III. HI 21cm observations of 1194 spiral galaxies with the Green Bank Telescope
• Determination of the large scale volume weighted halo velocity bias in simulations
• Velocity and mass bias in the distribution of dark matter halos
• On the halo velocity bias

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• Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
• Joint analysis of 6dFGS and SDSS peculiar velocities for the growth rate of cosmic structure and tests of gravity
• 2MTF VI. Measuring the velocity power spectrum
• The Redshift Space Momentum Power Spectrum II: measuring the growth rate from the combined 2MTF and 6dFGSv surveys
• 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
• Joint growth rate measurements from redshift-space distortions and peculiar velocities in the 6dF Galaxy Survey
• The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys
• A local measurement of the growth rate from peculiar velocities and galaxy clustering correlations in the 6dF Galaxy Survey
• Complementarity of Peculiar Velocity Surveys and Redshift Space Distortions for Testing Gravity
• Testing Gravity Using Type Ia Supernovae Discovered by Next-Generation Wide-Field Imaging Surveys
• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
• Forecast for growth-rate measurement using peculiar velocities from LSST supernovae
• Constraining modified gravity scenarios with the 6dFGS and SDSS galaxy peculiar velocity datasets
• The hyperplane of early-type galaxies: using stellar population properties to increase the precision and accuracy of the fundamental plane as a distance indicator
• Statistically bias-minimized peculiar velocity catalogs from Gibbs point processes and Bayesian inference
• Improved Methods for Estimating Peculiar Velocity Correlation Functions Using Volume Weighting