Local Supercluster Dynamics: External Tidal Impact of the PSCz sample traced by Optimized Numerical Least Action Method

Abstract

We assess the extent to which the PSCz survey encapsulates the complete or major share of matter inhomogeneities responsible for the external tidal forces affecting the peculiar velocity flow within the Local Supercluster [LS]. We investigate this issue on the basis of mock galaxy catalogs drawn from two large Nbody simulations of cosmic structure formation in two different cosmological scenarios. From these a variety of datasets is selected imitating the observational conditions of either the volume-limited LS mimicking NBG catalog or the deeper magnitude-limited PSCz catalog. The mildly nonlinear dynamics in the mock NBG and PSCz velocities are analyzed by means of an optimized implementation of the Least Action Principle, the Fast Action Method [FAM]. By comparing the modeled and true velocities of the corresponding mock catalogs we assess the extent and nature of the external tidal influence on the LS volume. We find that the dynamics in the inner 30Mpc/h volume is strongly affected by the external forces. Most of the external forces can be traced back to a depth of no more than 100Mpc/h. This is concluded from the fact that the FAM reconstructions of the 100Mpc/h PSCz volume appear to have included most gravitational influences. In addition, we demonstrate that for all considered cosmological models the bulk flow and shear components of the tidal velocity field generated by the external distribution of PSCz galaxies provides sufficient information for representing the full external tidal force field.

46 pages, 19 figures. Accepted for publication in A&A. Full ps version available at http://www.phys.huji.ac.il/~emilio/psczfamtide_paper.html

References in corpus (52)

• The 3D power spectrum of galaxies from the SDSS
• How Filaments are Woven into the Cosmic Web
• Using the Evolution of Clusters to Constrain Omega
• The Assembly and Merging History of Supermassive Black Holes in Hierarchical Models of Galaxy Formation
• The 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe
• Galaxy Clustering in Early SDSS Redshift Data
• The density and peculiar velocity fields of nearby galaxies
• The Las Campanas Redshift Survey
• The PSCz Catalogue
• Homogeneous Velocity-Distance Data for Peculiar Velocity Analysis. III. The Mark III Catalog of Galaxy Peculiar Velocities
• The IRAS 1.2 Jy Survey: Redshift Data
• The SBF Survey of Galaxy Distances. II. Local and Large-Scale Flows
• The Stromlo-APM Redshift Survey II. Variation of Galaxy Clustering with Morphology and Luminosity
• Wiener Reconstruction of The Large Scale Structure
• The 2dF Galaxy Redshift Survey: The amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing
• The I-Band Tully-Fisher Relation for Cluster Galaxies: Data Presentation
• Dynamics of Cosmic Flows
• The I-Band Tully-Fisher Relation for Cluster Galaxies: a Template Relation, its Scatter and Bias Corrections
• Approximation Methods for Non-linear Gravitational Clustering
• The power spectrum of galaxies in the 2dF 100k redshift survey
• Streaming motions of galaxy clusters within 12000 km/s - V. The peculiar velocity field
• Constraining Peaks in Gaussian Primordial Density Fields: an Application of the Hoffman-Ribak Method
• The APM Galaxy Survey III: An Analysis of Systematic Errors in the Angular Correlation Function and Cosmological Implications
• Constrained Simulations of the Real Universe: the Local Supercluster
• Towards a refined cosmic concordance model: joint 11-parameter constraints from CMB and large-scale structure
• A Non Parametric Model for the Cosmic Velocity Field
• Maximum-Likelihood Comparisons of Tully-Fisher and Redshift Data: Constraints on Omega and Biasing
• Action Principle Solutions For Galaxy Motions Within 3000 Km/s
• Mock 2dF and SDSS galaxy redshift surveys
• Simulating the Formation of the Local Galaxy Population
• Comparison of Velocity and Gravity Fields: The Mark III Tully-Fisher Catalog Versus the IRAS 1.2 Jy Survey
• The Real Space Power Spectrum of the PSCz Survey from 0.01 to 300 h/Mpc
• The Optical Redshift Survey: Sample Selection and the Galaxy Distribution
• Linear Redshift Distortions and Power in the PSCz Survey
• Radial and Transverse Velocities of Nearby Galaxies
• Redshift-Distance Survey of Early-type Galaxies. I. Sample Selection, Properties and Completeness
• On the least action principle in cosmology
• Reconstruction of cosmological density and velocity fields in the Lagrangian Zel'dovich Approximation
• Simulating Our Cosmological Neighborhood: Mock Catalogs for Velocity Analysis
• Adding Long-Wavelength Power to N-body Simulations
• Wiener Reconstruction of the IRAS 1.2Jy Galaxy Redshift Survey: Cosmographical Implications
• Peculiar Velocity Reconstruction with Fast Action Method: Tests on Mock Redshift Surveys
• On density and velocity fields and beta from the IRAS PSCz survey
• Adding Long Wavelength Modes to an $N$-Body Simulation
• Comparing the SFI Peculiar Velocities with the PSCz Gravity Field: a VELMOD analysis
• Comparison of the ENEAR Peculiar Velocities with the PSCz Gravity Field
• Testing the Least Action Principle in an Omega_0=1 Universe
• On Variational Dynamics in Redshift Space
• The Least Action Principle And The Spin Of Galaxies In The Local Group
• Biased Estimates of Omega from Comparing Smoothed Predicted Velocity Fields to Unsmoothed Peculiar Velocity Measurements
• Using Perturbative Least Action to Recover Cosmological Initial Conditions
• Predicting the peculiar velocities of nearby PSC-z galaxies using the Least Action Principle

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