Statistics of Voids in the 2dF Galaxy Redshift Survey

Abstract

We present a statistical analysis of voids in the 2dF galaxy redshift survey (2dFGRS). In order to detect the voids, we have developed two robust algorithms. We define voids as non-overlapping maximal spheres empty of halos or galaxies with mass or luminosity above a given one. We search for voids in cosmological $N$-Body simulations to test the performance of our void finders. We obtain and analyze the void statistics for several volume-limited samples for the North Galactic Strip (NGP) and the South Galactic Strip (SGP) constructed from the 2dFGRS full data release. We find that the results obtained from the NGP and the SGP are statistically compatible. From the results of several statistical tests we conclude that voids are essentially uncorrelated, with at most a mild anticorrelation and that there is a dependence of the void number density on redshift at least at the 99.5% confidence level. We develop a technique to correct the distortion caused by the fact that we use the redshift as the radial coordinate. We calibrate this technique with mock catalogues and find that the correction might be of some relevance to carry out accurate inferences from void statistics. We study the statistics of the galaxies inside nine nearby voids. We find that galaxies in voids are not randomly distributed: they form structures like filaments. We also obtain the galaxy number density profile in voids. This profile follow a similar but steeper trend to that follow by halos in voids.

arXiv comment16 pages, 10 figures, replaced to match the published version in MNRAS

References in corpus (28)

• The Sloan Digital Sky Survey: Technical Summary
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Where are the missing galactic satellites?
• The 2dF Galaxy Redshift Survey: Spectra and redshifts
• The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications
• The 3D power spectrum of galaxies from the SDSS
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations
• Galaxy Clustering in Early SDSS Redshift Data
• A hierarchy of voids: Much ado about nothing
• The 2dF Galaxy Redshift Survey: The b_J-band galaxy luminosity function and survey selection function
• The Halo Occupation Distribution and the Physics of Galaxy Formation
• The Void Phenomenon
• Voids in the PSCz Survey and the Updated Zwicky Catalog
• Voids in the 2dF Galaxy Redshift Survey
• The structure of voids
• Spectroscopic Properties of Void Galaxies in the Sloan Digital Sky Survey
• The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey
• Voids in a $\Lambda$CDM Universe
• Voids in the Large-Scale Structure
• Mock 2dF and SDSS galaxy redshift surveys
• Voids in the Simulated Local Universe
• The Size and Shape of Local Voids
• The 2dF Galaxy Redshift Survey: voids and hierarchical scaling models
• The DEEP2 Galaxy Redshift Survey: The Evolution of Void Statistics from z~1 to z~0
• The Mass Function of Void Galaxies in the SDSS Data Release 2
• Tracing the Nature of Dark Energy with Galaxy Distribution

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• A hierarchy of voids: Much ado about nothing
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• A Cosmic Watershed: the WVF Void Detection Technique
• The Aspen--Amsterdam Void Finder Comparison Project
• Potential sources of contamination to weak lensing measurements: constraints from N-body simulations
• Galaxy alignments: Observations and impact on cosmology
• Precision cosmology with voids: definition, methods, dynamics
• The Cosmic Web: Geometric Analysis
• "Swiss-Cheese" Inhomogeneous Cosmology & the Dark Energy Problem
• The Properties of Galaxies in Voids
• Cosmic Voids: structure, dynamics and galaxies
• Clues on void evolution II: Measuring density and velocity profiles on SDSS galaxy redshift space distortions
• Void Statistics in Large Galaxy Redshift Surveys: Does Halo Occupation of Field Galaxies Depend on Environment?
• Local Voids as the Origin of Large-angle Cosmic Microwave Background Anomalies: The Effect of a Cosmological Constant
• Only the Lonely: H I Imaging of Void Galaxies
• The CMB cold spot: texture, cluster or void?
• The Void Phenomenon Explained
• Clues on void evolution I: Large scale galaxy distributions around voids
• Constraints on large scale inhomogeneities from WMAP-5 and SDSS: confrontation with recent observations
• Voids in the 2dFGRS and LCDM simulations: spatial and dynamical properties
• The orientation of galaxy dark matter haloes around cosmic voids
• The orientation of disk galaxies around large cosmic voids
• Minivoids in the Local Volume
• An Interacting Galaxy System Along a Filament in a Void
• Signatures of the Primordial Universe from Its Emptiness: Measurement of Baryon Acoustic Oscillations from Minima of the Density Field
• The Void Galaxy Survey: Star Formation Properties
• A hierarchy of voids: More ado about nothing
• Assembly of filamentary void galaxy configurations
• Towards understanding the structure of voids in the cosmic web
• The Void Galaxy Survey: Photometry, structure and identity of void galaxies
• Clues on void evolution III: Structure and dynamics in void shells
• The alignment of dark matter halos with the cosmic web
• The structure of cosmic voids in a LCDM Universe
• Structural Analysis of the SDSS Cosmic Web I.Nonlinear Density Field Reconstructions
• Excursion Sets and Non-Gaussian Void Statistics
• Isolated galaxies in hierarchical galaxy formation models - present-day properties and environmental histories
• Measuring Baryon Acoustic Oscillations from the clustering of voids
• Dark Matter Gravitational Clustering With a Long-Range Scalar Interaction
• Large-scale modulation of star formation in void walls
• Cascading on extragalactic background light
• CMB Lensing and the WMAP Cold Spot
• DIVE in the cosmic web: voids with Delaunay Triangulation from discrete matter tracer distributions
• Explicit Cosmological Coarse Graining via Spatial Averaging
• Spin alignment of dark matter haloes in the shells of the largest voids
• Statistical analysis of galaxy surveys - III: The non-linear clustering of red and blue galaxies in the 2dFGRS
• Cosmic voids detection without density measurements
• Testing spherical evolution for modelling void abundances
• A Flexible Analytic Model of Cosmic Variance in the First Billion Years
• Alignment of galaxy spins in the vicinity of voids
• Structure Formation, Backreaction and Weak Gravitational Fields
• Low and High Surface Brightness Galaxies at Void Walls
• On the importance of high redshift intergalactic voids
• The statistics of voids as a tool to constrain cosmological parameters: sigma_8 and Omega_m h
• The Averaging Problem in Cosmology
• Low-Density Structures in the Local Universe. II. Nearby Cosmic Voids
• Local and large-scale effects on the astrophysics of void-galaxies
• The Void Galaxy Survey
• Voids in the SDSS Galaxy Survey
• CMB Cold Spot in the Planck light
• Quantifying the coherent outflows of galaxies around voids in the SDSS DR7
• Dynamics of Void and its Shape in Redshift Space
• Constraining cosmological parameters using void statistics from the SDSS survey
• Practical Statistics for the Voids Between Galaxies
• Spin alignment around TNG300-1 voids
• Cluster-counterpart Voids: Void Identification from Galaxy Density Field
• $\Lambda$ effect in the cosmological expansion of voids
• Large Scale Distribution of Galaxies in The Field HS 47.5-22. I. Data Analysis Technique