The two-point correlation function and morphological segregation in the Optical Redshift Survey

Abstract

We study the clustering of galaxies in real and redshift space using the Optical Redshift Survey (ORS). We estimate the two point correlation function in redshift space, $\xi (s)$, for several subsamples of ORS, spanning nearly a factor of 30 in volume and detect significant variations in $\xi (s)$ among the subsamples covering small volumes. For volumes \gtsima $(75h^{-1}\mathrm{Mpc}{)}^3$ the ORS subsamples present very similar clustering patterns. Powerlaw fits to $\xi (s)$ give best-fit values in the range $1.5\le {\gamma }_s\le 1.7$ and $6.5\le s_0\le 8.8h^{-1}$ Mpc for several samples extending to redshifts of 8000 km s${}^{-1}$. We find that $\xi (s)$ is larger for the magnitude-limited sample than for diameter-limited one within a radius of 4000 km s${}^{-1}$. We interpret this as an indirect result of morphological segregation coupled with differences in morphological mix. We split ORS into morphological subsamples and confirm the existence of morphological segregation of galaxies out to scales of $s\sim 10h^{-1}$ Mpc. Our results indicate that the relative bias factor between early type galaxies and late-types may be weakly dependent on scale. If real, this would suggest non-linear biasing. We also compute correlations as a function of radial and projected separations, $\xi (r_p,\pi )$ and derive the real space correlation function, $\xi (r)$. The results obtained in real space confirm those found using $\xi (s)$.

12 pages, 13 figures. Uses mn.sty. Accepted for publication in Monthly Notices

Cited by in corpus (75)

• The New Galaxy: Signatures of its Formation
• The Broad-band Optical Properties of Galaxies with Redshifts 0.0 < z < 0.2
• Galaxy Clustering in Early SDSS Redshift Data
• Relationship between environment and the broad-band optical properties of galaxies in the SDSS
• The 2dF Galaxy Redshift Survey: The dependence of galaxy clustering on luminosity and spectral type
• Stochastic Nonlinear Galaxy Biasing
• The Void Phenomenon
• The DEEP2 Galaxy Redshift Survey: Color and Luminosity Dependence of Galaxy Clustering at z~1
• The 2dF Galaxy Redshift Survey: The amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing
• The 2dF Galaxy Redshift Survey: galaxy clustering per spectral type
• Redshift-Space Distortions and the Real-Space Clustering of Different Galaxy Types
• The DEEP2 Galaxy Redshift Survey: Clustering of Galaxies in Early Data
• What aspects of galaxy environment matter?
• Non-linear Stochastic Galaxy Biasing in Cosmological Simulations
• The Large-Scale Smoothness of the Universe
• Southern Sky Redshift Survey: Clustering of Local Galaxies
• A Non Parametric Model for the Cosmic Velocity Field
• The Sloan Digital Sky Survey
• Nearby Optical Galaxies: Selection of the Sample and Identification of Groups
• The Physical Origin of Scale Dependent Bias in Cosmological Simulations
• Nonlinear Stochastic Biasing of Galaxies and Dark Halos in Cosmological Hydrodynamic Simulations
• The Las Campanas IR Survey. II. Photometric redshifts, comparison with models and clustering evolution
• Luminosity- and morphology-dependent clustering of galaxies
• Evolution of Cluster Red-Sequence Galaxies from redshift 0.8 to 0.4: ages, metallicities and morphologies
• Stochasticity of Bias and Nonlocality of Galaxy Formation: Linear Scales
• The scale-dependence of relative galaxy bias: encouragement for the halo model description
• Upper limits on neutrino masses from the 2dFGRS and WMAP: the role of priors
• Time Evolution of Galaxy Formation and Bias in Cosmological Simulations
• The Three-point Correlation Function of Galaxies Determined from the Las Campanas Redshift Survey
• The Masses, Ancestors and Descendents of Extremely Red Objects: Constraints from Spatial Clustering
• Comparing estimators of the galaxy correlation function
• Locally Biased Galaxy Formation and Large Scale Structure
• Spatial distribution of galactic halos and their merger histories
• A Cosmic Coincidence: The Power-Law Galaxy Correlation Function
• The Observed Evolution of Galaxy Clustering Vs. Epoch-Dependent Biasing Models
• PRIMUS: Enhanced Specific Star Formation Rates In Close Galaxy Pairs
• Spatially Resolved Galaxy Star Formation and its Environmental Dependence I
• Star Formation Quenching Timescale of Central Galaxies in a Hierarchical Universe
• Cosmology Inference from Biased Tracers using the EFT-based Likelihood
• Unbiased methods for removing systematics from galaxy clustering measurements
• Measuring the Nonlinear Biasing Function from a Galaxy Redshift Survey
• Bias and Hierarchical Clustering
• Unbiased pseudo-Cl power spectrum estimation with mode projection
• Observational constraints on particle production during inflation
• The Galaxy Correlation Function in the CNOC2 Redshift Survey: Dependence on Color, Luminosity and Redshift
• Morphology and luminosity segregation of galaxies in nearby loose groups
• The redshift-space two-point correlation functions of galaxies and groups in the Nearby Optical Galaxy sample
• A case devoid of bias: ORS voids vs. IRAS voids
• The Velocity Field Predicted by the Optical Redshift Survey
• How Stochastic is the Relative Bias Between Galaxy Types?
• Spatial and Dynamical Biases in Velocity Statistics of Galaxies
• The Gigaparsec WiggleZ Simulations: Characterising scale dependant bias and associated systematics in growth of structure measurements
• Accretion Disk Instabilities, CDM models and their role in Quasar Evolution
• Reconstructing Cosmic Peculiar Velocities from the Mildly Nonlinear Density Field
• Testing the homogeneity of the Universe using gamma-ray bursts
• Galaxy Clustering Evolution in the UH8K Weak Lensing Fields
• The zCOSMOS-Bright survey: the clustering of early and late galaxy morphological types since z~1
• The Caltech Faint Galaxy Redshift Survey XII: Clustering of Galaxies
• Wide Field Imaging of the Hubble Deep Field South Region II: The Evolution of Galaxy Clustering at z<1
• The Milky Way and Andromeda galaxies in a constrained hydrodynamical simulation: morphological evolution
• The Effect of Environment on Milky Way-mass galaxies in a Constrained Simulation of the Local Group
• Nonlinear redshift distortions: The two-point correlation function
• Measuring galaxy segregation using the mark connection function
• The evolution of galaxy clustering since z=1 from the Calar Alto Deep Imaging Survey
• The 2dF Galaxy Redshift Survey as a Cosmological Laboratory
• The SAMI Galaxy Survey: Detection of Environmental Dependence of Galaxy Spin in Observations and Simulations Using Marked Correlation Functions
• Correlation Function of Superclusters of Galaxies
• Towards breaking the Omega-bias degeneracy in density--velocity comparisons
• The Two-Point Correlation Function of Gamma-ray Bursts
• Reconstruction Analysis of the IRAS Point Source Catalog Redshift Survey
• The Redshift-Space Two Point Correlation Function of ELAIS-S1 Galaxies
• SOMBI: Bayesian identification of parameter relations in unstructured cosmological data
• Spatial clustering in the ESO-Sculptor Survey: two-point correlation functions by galaxy type at redshifts 0.1 - 0.5
• Comparing the redshift-space density field to the real-space velocity field
• Colour Dependence of the Distribution of IRAS Galaxies revealed by Multifractal Measures