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Title:
The 2dF Galaxy Redshift Survey: the amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing
Authors:
Lahav, Ofer; Bridle, Sarah L.; Percival, Will J.; Peacock, John A.; Efstathiou, George; Baugh, Carlton M.; Bland-Hawthorn, Joss; Bridges, Terry; Cannon, Russell; Cole, Shaun; Colless, Matthew; Collins, Chris; Couch, Warrick; Dalton, Gavin; de Propris, Roberto; Driver, Simon P.; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Jackson, Carole; Lewis, Ian; Lumsden, Stuart; Maddox, Steve; Madgwick, Darren S.; Moody, Stephen; Norberg, Peder; Peterson, Bruce A.; Sutherland, Will; Taylor, Keith
Affiliation:
AA(Institute of Mathematical Modelling, 4 Miusskaya sq., Moscow 125047, Russia), AB(Institute of Mathematical Modelling, 4 Miusskaya sq., Moscow 125047, Russia), AC(Keldysh Institute of Applied Mathematics, 4 Miusskaya sq., Moscow 125047, Russia), AD(Keldysh Institute of Applied Mathematics, 4 Miusskaya sq., Moscow 125047, Russia), AE(Institute of Mathematical Modelling, 4 Miusskaya sq., Moscow 125047, Russia), AF(Institute of Astronomy, Russian Academy of Science, 48 Pyatnitskaya str., Moscow 109017, Russia), AG(), AH(), AI(), AJ(Institute of Astronomy, Russian Academy of Science, 48 Pyatnitskaya str., Moscow 109017, Russia), AK(), AL(), AM(), AN(), AO(), AP(), AQ(), AR(Institute of Astronomy, Russian Academy of Science, 48 Pyatnitskaya str., Moscow 109017, Russia), AS(), AT(), AU(), AV(), AW(), AX(Institute of Mathematical Modelling, 4 Miusskaya sq., Moscow 125047, Russia), AY(Institute of Mathematical Modelling, 4 Miusskaya sq., Moscow 125047, Russia), AZ(Institute of Astronomy, Russian Academy of Science, 48 Pyatnitskaya str., Moscow 109017, Russia), BA(), BB(Keldysh Institute of Applied Mathematics, 4 Miusskaya sq., Moscow 125047, Russia), BC()
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 4, pp. 961-968. (MNRAS Homepage)
Publication Date:
07/2002
Origin:
MNRAS
MNRAS Keywords:
surveys, galaxies: general, galaxies: statistics, cosmic microwave background, cosmology: miscellaneous, surveys; galaxies: general; galaxies: statistics; cosmic microwave background; cosmology: miscellaneous
DOI:
10.1046/j.1365-8711.2002.05485.x
Bibliographic Code:
2002MNRAS.333..961L

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-1Mpc 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<k<0.15hMpc-1. If luminosity segregation operates on these scales, L* galaxies would be almost unbiased, b (L*, z=0)~0.96. These results are derived by assuming a flat ΛCDM Universe, and by marginalizing over other free parameters and fixing the spectral index n=1 and the optical depth due to reionization τ=0. We also study the best-fitting pair (Ωm, b), and the robustness of the results to varying n and τ. Various modelling corrections can each change the resulting b by 5-15 per cent. The results are compared with other independent measurements from the 2dFGRS itself, and from the Sloan Digital Sky Survey (SDSS), cluster abundance and cosmic shear.

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