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

Author(s)

Percival, Will J.; Baugh, Carlton; Bland-Hawthorn, Joss; Bridges, Terry J.; Cannon, Russell D.; Cole, Shaun; Colless, Matthew; Collins, Chris A.; Couch, Warrick; Dalton, Gavin B.; De Propris, Roberto; Driver, Simon P.; Efstathiou, George; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Jackson, C. A.; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Stephen J.; Moody, Stephen J.; Norberg, Peder; Peacock, John A.; Peterson, Bruce A.; Sutherland, William J.; Taylor, Keith

Available versions

Abstract

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.

Publication year

2001

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 327, no. 4 (Nov 2001), pp. 1297-1306

ISSN

0035-8711

Publisher

Wiley

Copyright

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.

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