A Caltech Library Service

The 2dF Galaxy Redshift Survey: the bias of galaxies and the density of the Universe

Verde, Licia and Heavens, Alan F. and Percival, Will J. and Matarrese, Sabino and Baugh, Carlton M. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Couch, Warrick and Dalton, Gavin and De Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Jackson, Carole and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren and Norberg, Peder and Peacock, John A. and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (2002) The 2dF Galaxy Redshift Survey: the bias of galaxies and the density of the Universe. Monthly Notices of the Royal Astronomical Society, 335 (2). pp. 432-440. ISSN 0035-8711. doi:10.1046/j.1365-8711.2002.05620.x.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We compute the bispectrum of the 2dF Galaxy Redshift Survey (2dFGRS) and use it to measure the bias parameter of the galaxies. This parameter quantifies the strength of clustering of the galaxies relative to the mass in the Universe. By analysing 80 × 10⁶ triangle configurations in the wavenumber range 0.1 < k < 0.5 h Mpc⁻¹ (i.e. on scales roughly between 5 and 30 h⁻¹ Mpc) we find that the linear bias parameter is consistent with unity: b₁ = 1.04 ± 0.11, and the quadratic (non-linear) bias is consistent with zero: b₂ =−0.054 ± 0.08. Thus, at least on large scales, optically selected galaxies do indeed trace the underlying mass distribution. The bias parameter can be combined with the 2dFGRS measurement of the redshift distortion parameter β ≃ Ω_m^(0.6)/b₁, to yield Ω_m = 0.27 ± 0.06 for the matter density of the Universe, a result that is determined entirely from this survey, independent of other data sets. Our measurement of the matter density of the Universe should be interpreted as Ω_m at the effective redshift of the survey (z = 0.17).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Verde, Licia0000-0003-2601-8770
Baugh, Carlton M.0000-0002-9935-9755
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Norberg, Peder0000-0002-5875-0440
Additional Information:© 2002 RAS. Accepted 2002 April 26. Received 2002 March 15; in original form 2001 December 11. LV is supported in part by NASA grant NAG5-7154, and acknowledges the University of Edinburgh for hospitality. AFH thanks Rutgers and Princeton Universities for hospitality. We are grateful to Raul Jimenez and David Spergel for useful discussions. The 2dF Galaxy Redshift Survey was made possible through the dedicated efforts of the staff of the Anglo-Australian Observatory, both in creating the 2dF instrument and in supporting it on the telescope. References
Funding AgencyGrant Number
Subject Keywords:galaxies: clusters: general, cosmological parameters, large-scale structure of Universe
Issue or Number:2
Record Number:CaltechAUTHORS:20200521-154904116
Persistent URL:
Official Citation:Licia Verde, Alan F. Heavens, Will J. Percival, Sabino Matarrese, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Roberto De Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren Madgwick, Peder Norberg, John A. Peacock, Bruce A. Peterson, Will Sutherland, Keith Taylor, The 2dF Galaxy Redshift Survey: the bias of galaxies and the density of the Universe, Monthly Notices of the Royal Astronomical Society, Volume 335, Issue 2, September 2002, Pages 432–440,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103387
Deposited By: George Porter
Deposited On:22 May 2020 17:02
Last Modified:16 Nov 2021 18:21

Repository Staff Only: item control page