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The 2dF Galaxy Redshift Survey: The power spectrum and the matter content of the Universe

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posted on 2024-08-06, 10:50 authored by Will J. Percival, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Warrick CouchWarrick Couch, Gavin Dalton, Roberto De Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl GlazebrookKarl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Stephen Moody, Peder Norberg, John A. Peacock, Bruce A. Peterson, Will Sutherland, Keith Taylor
The 2dF Galaxy Redshift Survey has now measured in excess of 160 000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct Fourier transform based technique. We argue that, within the k-space region 0.02 ≲ k ≲ 0.15 h Mpc-1, the shape of this spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analysed in detail. By convolving model spectra, we are able to fit the power-spectrum data and provide a measure of the matter content of the Universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68 per cent confidence limits on the total matter density times the Hubble parameter Ωm, h = 0.20 ± 0.03, and the baryon fraction Ωb/Ωm = 0.15 ± 0.07, assuming scale-invariant primordial fluctuations.

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ISSN

0035-8711

Journal title

Monthly Notices of the Royal Astronomical Society

Volume

327

Issue

4

Pagination

9 pp

Publisher

Wiley

Copyright statement

Copyright © 2001 RAS. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Language

eng

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