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The 2dF Galaxy Redshift Survey: the amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing

Lahav, O.; Bridle, S.L.; Percival, W.J.; Peacock, J.A.; Efstathiou, G.; Baugh, C.M.; Bland-Hawthorn, J.; Bridges, T.; Cannon, R.; Cole, S.; Colless, M.; Collins, C.; Couch, W.; Dalton, G.; de Propris, R.; Driver, S.P.; Ellis, R.S.; Frenk, C.S.; Glazebrook, K.; Jackson, C.; Lewis, I.; Lumsden, S.; Maddox, S.; Madgwick, D.S.; Moody, S.; Norberg, P.; Peterson, B.A.; Sutherland, W.; Taylor, K.

Authors

O. Lahav

S.L. Bridle

W.J. Percival

J.A. Peacock

G. Efstathiou

J. Bland-Hawthorn

T. Bridges

R. Cannon

M. Colless

C. Collins

W. Couch

G. Dalton

R. de Propris

S.P. Driver

R.S. Ellis

K. Glazebrook

C. Jackson

I. Lewis

S. Lumsden

S. Maddox

D.S. Madgwick

S. Moody

B.A. Peterson

W. Sutherland

K. Taylor



Abstract

We compare the amplitudes of fluctuations probed by the 2dF Galaxy Redshift Survey (2dFGRS) and by the latest measurements of the cosmic microwave background (CMB) anisotropies. By combining the 2dFGRS and CMB data, we find the linear-theory rms mass fluctuations in 8 h−1 Mpc spheres to be σ8m=0.73±0.05 (after marginalization over the matter density parameter Ωm and three other free parameters). This normalization is lower than the COBE normalization and previous estimates from cluster abundance, but it is in agreement with some revised cluster abundance determinations. We also estimate the scale-independent bias parameter of present-epoch Ls=1.9L∗ APM-selected galaxies to be b(Ls,z=0)=1.10±0.08 on comoving scales of 0.02

Citation

Lahav, O., Bridle, S., Percival, W., Peacock, J., Efstathiou, G., Baugh, C., …Taylor, K. (2002). The 2dF Galaxy Redshift Survey: the amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing. Monthly Notices of the Royal Astronomical Society, 333(4), 961-968. https://doi.org/10.1046/j.1365-8711.2002.05485.x

Journal Article Type Article
Publication Date 2002-07
Deposit Date Apr 19, 2011
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 333
Issue 4
Pages 961-968
DOI https://doi.org/10.1046/j.1365-8711.2002.05485.x