The 2dF Galaxy Redshift Survey: spherical harmonics analysis of fluctuations in the final catalogue

2004/06/23 by Will J. Percival, Daniel Burkey, Alan Heavens +27 · 5 citations
Engineering · Physics and Astronomy · #Amplitude #Astronomy and Astrophysical Research #Density contrast #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Redshift #Redshift survey #Space Technology and Applications #Spectral density #Spherical harmonics #astro-ph

paper · pdf · doi:10.1111/j.1365-2966.2004.08146.x

published as Mon.Not.Roy.Astron.Soc.353:1201,2004 · 19 pages, 11 figures, MNRAS accepted

arxiv created 2004/06/23 · openalex publication_date 2004/10/01 · arxiv updated 2011/03/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present the result of a decomposition of the 2dF Galaxy Redshift Survey (2dFGRS) galaxy overdensity field into an orthonormal basis of spherical harmonics and spherical Bessel functions. Galaxies are expected to directly follow the bulk motion of the density field on large scales, so the absolute amplitude of the observed large‐scale redshift‐space distortions caused by this motion is expected to be independent of galaxy properties. By splitting the overdensity field into radial and angular components, we linearly model the observed distortion and obtain the cosmological constraint Ω0.6mσ8= 0.46 ± 0.06. The amplitude of the linear redshift‐space distortions relative to the galaxy overdensity field is dependent on galaxy properties and, for L* galaxies at redshift z= 0, we measure β(L*, 0) = 0.58 ± 0.08, and the amplitude of the overdensity fluctuations b(L*, 0)σ8= 0.79 ± 0.03, marginalizing over the power spectrum shape parameters. Assuming a fixed power spectrum shape consistent with the full Fourier analysis produces very similar parameter constraints.

Citations

• The Solar Motion Relative to the Local Group
• The Millennium Galaxy Catalogue: the photometric accuracy, completeness and contamination of the 2dFGRS and SDSS-EDR/DR1 data sets
• A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic Results
• Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Weak Gravitational Lensing by Large-Scale Structure
• The power spectrum of galaxies in the 2dF 100k redshift survey
• The Dipole Observed in the COBE DMR 4 Year Data

Cited by

• Spatial and dynamical properties of voids in a Λ cold dark matter universe
• Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS
• 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
• Wide-angle effects for peculiar velocities
• Building a digital twin of a luminous red galaxy spectroscopic survey: galaxy properties and clustering covariance