The 2dF Galaxy Redshift Survey: stochastic relative biasing between galaxy populations
Vivienne Wild,John A. Peacock,Ofer Lahav,Ofer Lahav,E. Conway,Stephen J. Maddox,Ivan K. Baldry,Carlton M. Baugh,Joss Bland-Hawthorn,Terry J. Bridges,Russell D. Cannon,Shaun Cole,Matthew Colless,Chris A. Collins,Warrick J. Couch,Gavin Dalton,Gavin Dalton,Roberto De Propris,Simon P. Driver,George Efstathiou,Richard S. Ellis,Carlos S. Frenk,Karl Glazebrook,Carole Jackson,Ian Lewis,Stuart Lumsden,Darren Madgwick,Peder Norberg,Bruce A. Peterson,William J. Sutherland,Keith Taylor +30 more
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In this paper, the authors performed a joint counts-in-cells analysis on galaxies in the 2dF Galaxy Redshift Survey, classified by both colour and spectral type, eta, as early- or late-type galaxies.Abstract:
It is well known that the clustering of galaxies depends on galaxy type. Such relative bias complicates the inference of cosmological parameters from galaxy redshift surveys, and is a challenge to theories of galaxy formation and evolution. In this paper we perform a joint counts-in-cells analysis on galaxies in the 2dF Galaxy Redshift Survey, classified by both colour and spectral type, eta, as early- or late-type galaxies. We fit three different models of relative bias to the joint probability distribution of the cell counts, assuming Poisson sampling of the galaxy density field. We investigate the non-linearity and stochasticity of the relative bias, with cubic cells of side 10 less than or equal toLless than or equal to 45 Mpc (h= 0.7). Exact linear bias is ruled out with high significance on all scales. Power-law bias gives a better fit, but likelihood ratios prefer a bivariate lognormal distribution, with a non-zero 'stochasticity', i.e. scatter that may result from physical effects on galaxy formation other than those from the local density field. Using this model, we measure a correlation coefficient in log-density space (r(LN)) of 0.958 for cells of length L= 10 Mpc, increasing to 0.970 by L= 45 Mpc. This corresponds to a stochasticity sigma(b)/(b) over cap of 0.44 +/- 0.02 and 0.27 +/- 0.05, respectively. For smaller cells, the Poisson-sampled lognormal distribution presents an increasingly poor fit to the data, especially with regard to the fraction of completely empty cells. We compare these trends with the predictions of semi-analytic galaxy formation models: these match the data well in terms of the overall level of stochasticity, variation with scale and the fraction of empty cells.read more
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The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications
Shaun Cole,Will J. Percival,John A. Peacock,Peder Norberg,Carlton M. Baugh,Carlos S. Frenk,Ivan K. Baldry,Joss Bland-Hawthorn,Terry J. Bridges,Russell D. Cannon,Matthew Colless,Chris A. Collins,Warrick J. Couch,Nicholas Cross,Nicholas Cross,Gavin Dalton,Vincent R. Eke,Roberto De Propris,Simon P. Driver,George Efstathiou,Richard S. Ellis,Karl Glazebrook,Carole Jackson,Adrian Jenkins,Ofer Lahav,Ian Lewis,Stuart Lumsden,Stephen J. Maddox,Darren Madgwick,Bruce A. Peterson,William J. Sutherland,Keith Taylor +31 more
TL;DR: In this paper, a power-spectrum analysis of the final 2DF Galaxy Redshift Survey (2dFGRS) employing a direct Fourier method is presented, and the covariance matrix is determined using two different approaches to the construction of mock surveys, which are used to demonstrate that the input cosmological model can be correctly recovered.
Journal ArticleDOI
Cosmological constraints from the SDSS luminous red galaxies
Max Tegmark,Daniel J. Eisenstein,Michael A. Strauss,David H. Weinberg,Michael R. Blanton,Joshua A. Frieman,Joshua A. Frieman,Masataka Fukugita,James E. Gunn,Andrew J. S. Hamilton,Gillian R. Knapp,Robert C. Nichol,Jeremiah P. Ostriker,Nikhil Padmanabhan,Will J. Percival,David J. Schlegel,Donald P. Schneider,Roman Scoccimarro,Uroš Seljak,Uroš Seljak,Hee-Jong Seo,Molly E. C. Swanson,Alexander S. Szalay,Michael S. Vogeley,Jaiyul Yoo,Idit Zehavi,Kevork N. Abazajian,Scott F. Anderson,James Annis,Neta A. Bahcall,Bruce A. Bassett,Andreas A. Berlind,Jon Brinkmann,Tamás Budavári,Francisco J. Castander,Andrew J. Connolly,István Csabai,Mamoru Doi,Douglas P. Finkbeiner,Douglas P. Finkbeiner,Bruce Gillespie,Karl Glazebrook,Gregory S. Hennessy,David W. Hogg,Željko Ivezić,Željko Ivezić,Bhuvnesh Jain,David Johnston,Stephen M. Kent,D. Q. Lamb,Brian C. Lee,Huan Lin,Jon Loveday,Robert H. Lupton,Jeffrey A. Munn,Kaike Pan,Changbom Park,John Peoples,Jeffrey R. Pier,Adrian Pope,Michael Richmond,Constance M. Rockosi,Ryan Scranton,Ravi K. Sheth,Albert Stebbins,Christopher Stoughton,István Szapudi,Douglas L. Tucker,Daniel E. Vanden Berk,Brian Yanny,Donald G. York +70 more
TL;DR: In this paper, the authors employed a matrix-based power spectrum estimation method using pseudo-Karhunen-Loeve eigenmodes, producing uncorrelated minimum-variance measurements in 20 k-bands of both the clustering power and its anisotropy due to redshift-space distortions.
Journal ArticleDOI
Galaxy bimodality versus stellar mass and environment
Ivan K. Baldry,Michael L. Balogh,Richard G. Bower,Karl Glazebrook,Robert C. Nichol,Steven P. Bamford,Tamás Budavári +6 more
TL;DR: In this article, the authors analyse a z < 0.1 galaxy sample from the Sloan Digital Sky Survey focusing on the variation in the galaxy color bimodality with stellar mass M and projected neighbour density Σ, and on measurements of the galaxy stellar mass functions.
Journal ArticleDOI
Measuring the Baryon Acoustic Oscillation scale using the Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey
Will J. Percival,Shaun Cole,Daniel J. Eisenstein,Robert C. Nichol,John A. Peacock,Adrian Pope,Alexander S. Szalay +6 more
TL;DR: In this article, a method to constrain general cosmological models using Baryon Acoustic Oscillation (BAO) distance measurements from galaxy samples covering different redshift ranges is introduced.
Journal ArticleDOI
Large-scale galaxy bias
TL;DR: In this paper, the authors present a comprehensive overview of galaxy bias, that is, the statistical relation between the distribution of galaxies and matter, which forms the basis of the rigorous perturbative description of galaxy clustering, under the assumptions of General Relativity and Gaussian, adiabatic initial conditions.
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