A comparison of the galaxy peculiar velocity field with the PSCz gravity field-- A Bayesian hyper-parameter method

Abstract

We constructed a Bayesian hyper-parameter statistical method to quantify the difference between predicted velocities derived from the observed galaxy distribution in the \textit{IRAS}-PSC$z$ redshift survey and peculiar velocities measured using different distance indicators. In our analysis we find that the model--data comparison becomes unreliable beyond $70 \hmpc$ because of the inadequate sampling by \textit{IRAS} survey of prominent, distant superclusters, like the Shapley Concentration. On the other hand, the analysis of the velocity residuals show that the PSC$z$ gravity field provides an adequate model to the local, $\le 70 \hmpc$, peculiar velocity field. The hyper-parameter combination of ENEAR, SN, A1SN and SFI++ catalogues in the Bayesian framework constrains the amplitude of the linear flow to be $\beta =0.53\pm 0.014$. For an rms density fluctuations in the PSC$z$ galaxy number density ${\sigma }_8^{\mathrm{gal}}=0.42\pm 0.03$, we obtain an estimate of the growth rate of density fluctuations $f{\sigma }_8(z\sim 0)=0.42\pm 0.033$, which is in excellent agreement with independent estimates based on different techniques.

14 pages, 32 figures, MNRAS in press, matched the MNRAS published version

References in corpus (7)

• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• SFI++ I: A New I-band Tully-Fisher Template, the Cluster Peculiar Velocity Dispersion and H0
• The BigBOSS Experiment
• Constraints on standard and non-standard early Universe models from CMB B-mode polarization

Cited by in corpus (23)

• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• Joint analysis of 6dFGS and SDSS peculiar velocities for the growth rate of cosmic structure and tests of gravity
• Are peculiar velocity surveys competitive as a cosmological probe?
• Velocity correction for Hubble constant measurements from standard sirens
• A Measurement of the Kinetic Sunyaev-Zel'dovich Signal Toward MACS J0717.5+3745
• The Parkes HI Zone of Avoidance Survey
• Cosmic bulk flows on 50 {h}^{-1}Mpc scales: A Bayesian hyper-parameter method and multishells likelihood analysis
• 2MTF IV. A bulk flow measurement of the local Universe
• Constrained realizations of 2MRS density and peculiar velocity fields: growth rate and local flow
• An estimation of local bulk flow with the maximum-likelihood method
• 2MTF V. Cosmography, Beta, and the residual bulk flow
• Large-scale Cosmic Flows from Cosmicflows-2 Catalog
• Studying the Peculiar Velocity Bulk Flow in a Sparse Survey of Type-Ia SNe
• Reconstructing the cosmological density and velocity fields from redshifted galaxy distributions using V-net
• Large-scale density and velocity field reconstructions with neural networks
• Constraining cosmology with pairwise velocity estimator
• How to combine correlated data sets -- A Bayesian hyperparameter matrix method
• Neural network reconstruction of density and velocity fields from the 2MASS Redshift Survey
• Independent constraints on local non-Gaussianity from the peculiar velocity and density fields
• Gaussianization of peculiar velocities and bulk flow measurement
• Precise peculiar velocities from gravitational waves accompanied by electromagnetic signals and cosmological applications
• Velocities hasten to tell us about the Universe
• Squared-field cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm intensity mapping