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25 April 2024

» arxiv » astro-ph/0404276

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The nature of the relative bias between galaxies of different spectral type in 2dFGRS
E. Conway ; S. Maddox ; V. Wild ; J. A. Peacock ; E. Hawkins ; P. Norberg ; D. S. Madgwick ; I. K. Baldry ; C. M. Baugh ; J. Bland-Hawthorn ; T. Bridges ; R. Cannon ; S. Cole ; M. Colless ; C. Collins ; W. Couch ; G. Dalton ; R. De Propris ; S. P. Driver ; G. Efstathiou ; R. S. Ellis ; C. S. Frenk ; K. Glazebrook ; C. Jackson ; B. Jones ; O. Lahav ; I. Lewis ; S. Lumsden ; W. Percival ; B. A. Peterson ; W. Sutherland ; K. Taylor ;
Date:	14 Apr 2004
Journal:	Mon.Not.Roy.Astron.Soc. 356 (2005) 456-474
Subject:	astro-ph
Affiliation:	The 2dFGRS Team
Abstract:	We present an analysis of the relative bias between early- and late-type galaxies in the Two-degree Field Galaxy Redshift Survey (2dFGRS). Our analysis examines the joint counts in cells between early- and late-type galaxies, using approximately cubical cells with sides ranging from 7h^{-1}Mpc to 42h^{-1}Mpc. We measure the variance of the counts in cells using the method of Efstathiou et al. (1990), which we find requires a correction for a finite volume effect. We fit lognormal models to the one-point density distribution and develop methods of dealing with biases in the recovered variances resulting from this technique. We directly fit deterministic models for the joint density distribution function, f(delta_E,delta_L), to the joint counts in cells using a maximum likelihood technique. Our results are consistent with a scale invariant relative bias factor on all scales studied. Linear bias is ruled out on scales less than l=28h^{-1}Mpc. A power-law bias model is a significantly better fit to the data on all but the largest scales studied; the relative goodness of fit of this model as compared to that of the linear bias model suggests that any nonlinearity is negligible for l>~40h^{-1}Mpc, consistent with the expectation from theory that the bias should become linear on large scales. (abridged)
Source:	arXiv, astro-ph/0404276
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