A Caltech Library Service

A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey

Peacock, John A. and Ellis, Richard S. and Taylor, Keith (2001) A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey. Nature, 410 (6825). pp. 169-173. ISSN 0028-0836.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


The large-scale structure in the distribution of galaxies is thought to arise from the gravitational instability of small fluctuations in the initial density field of the Universe. A key test of this hypothesis is that forming superclusters of galaxies should generate a systematic infall of other galaxies. This would be evident in the pattern of recessional velocities, causing an anisotropy in the inferred spatial clustering of galaxies. Here we report a precise measurement of this clustering, using the redshifts of more than 141,000 galaxies from the two-degree-field (2dF) galaxy redshift survey. We determine the parameter β = Ω ^(0.6)/b = 0.43 ± 0.07, where Ω is the total mass-density parameter of the Universe and b is a measure of the 'bias' of the luminous galaxies in the survey. (Bias is the difference between the clustering of visible galaxies and of the total mass, most of which is dark.) Combined with the anisotropy of the cosmic microwave background, our results favour a low-density Universe with Ω ≈ 0.3.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 2001 Macmillan Magazines Ltd. Received 20 December 2000; Accepted 30 January 2001. The 2dF Galaxy Redshift Survey was made possible through the dedicated efforts of the staff of the Anglo-Australian Observatory, both in creating the two-degree-field instrument and in supporting it on the telescope.
Issue or Number:6825
Record Number:CaltechAUTHORS:20150330-154520734
Persistent URL:
Official Citation:A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey p169 John A. Peacock, Shaun Cole, Peder Norberg, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell D. Cannon, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Kathryn Deeley, 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, Will J. Percival, Bruce A. Peterson, Ian Price, Will Sutherland and Keith Taylor doi:10.1038/35065528
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56220
Deposited By: Ruth Sustaita
Deposited On:31 Mar 2015 16:14
Last Modified:26 Nov 2019 11:15

Repository Staff Only: item control page