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

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

doi:10.1046/j.1365-8711.2002.05485.x

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

Ofer Lahav, Sarah L. Bridle, Will J. Percival, John A. Peacock, George Efstathiou, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Warrick Couch, Gavin Dalton, Roberto De Propris, Simon P. Driver, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole JacksonIan Lewis, Stuart Lumsden, Steve Maddox, Darren S. Madgwick, Stephen Moody, Peder Norberg, Bruce A. Peterson, Will Sutherland, Keith Taylor

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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 <k <0.15 h Mpc-1. If luminosity segregation operates on these scales, L* galaxies would be almost unbiased, b(L*,z = O) ≈ 0.96. These results are derived by assuming a flat ACDM 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.

Original language	English
Pages (from-to)	961-968
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	333
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-8711.2002.05485.x
Publication status	Published - 11 Jul 2002

Keywords

Cosmic microwave background
Cosmology: miscellaneous
Galaxies: general
Galaxies: statistics
Surveys

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10.1046/j.1365-8711.2002.05485.x

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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., ... 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

@article{24bc76291525499a9d72dc220707d55f,

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

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 <k <0.15 h Mpc-1. If luminosity segregation operates on these scales, L* galaxies would be almost unbiased, b(L*,z = O) ≈ 0.96. These results are derived by assuming a flat ACDM 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.",

keywords = "Cosmic microwave background, Cosmology: miscellaneous, Galaxies: general, Galaxies: statistics, Surveys",

author = "Ofer Lahav and Bridle, {Sarah L.} and Percival, {Will J.} and Peacock, {John A.} and George Efstathiou and Baugh, {Carlton M.} and Joss Bland-Hawthorn and Terry Bridges and Russell Cannon and Shaun Cole and Matthew Colless and Chris Collins and Warrick Couch and Gavin Dalton and {De Propris}, Roberto and Driver, {Simon P.} and Ellis, {Richard S.} and Frenk, {Carlos S.} and Karl Glazebrook and Carole Jackson and Ian Lewis and Stuart Lumsden and Steve Maddox and Madgwick, {Darren S.} and Stephen Moody and Peder Norberg and Peterson, {Bruce A.} and Will Sutherland and Keith Taylor",

year = "2002",

month = jul,

day = "11",

doi = "10.1046/j.1365-8711.2002.05485.x",

language = "English",

volume = "333",

pages = "961--968",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "1365-2966",

publisher = "Oxford University Press",

number = "4",

}

Lahav, O, Bridle, SL, Percival, WJ, Peacock, JA, Efstathiou, G, Baugh, CM, Bland-Hawthorn, J, Bridges, T, Cannon, R, Cole, S, Colless, M, Collins, C, Couch, W, Dalton, G, De Propris, R, Driver, SP, Ellis, RS, Frenk, CS, Glazebrook, K, Jackson, C, Lewis, I, Lumsden, S, Maddox, S, Madgwick, DS, Moody, S, Norberg, P, Peterson, BA, Sutherland, W & 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, vol. 333, no. 4, pp. 961-968. https://doi.org/10.1046/j.1365-8711.2002.05485.x

TY - JOUR

T1 - The 2dF Galaxy Redshift Survey: The amplitudes of fluctuations in the 2dFGRS and the CMB, and implications for galaxy biasing

AU - Lahav, Ofer

AU - Bridle, Sarah L.

AU - Percival, Will J.

AU - Peacock, John A.

AU - Efstathiou, George

AU - Baugh, Carlton M.

AU - Bland-Hawthorn, Joss

AU - Bridges, Terry

AU - Cannon, Russell

AU - Cole, Shaun

AU - Colless, Matthew

AU - Collins, Chris

AU - Couch, Warrick

AU - Dalton, Gavin

AU - De Propris, Roberto

AU - Driver, Simon P.

AU - Ellis, Richard S.

AU - Frenk, Carlos S.

AU - Glazebrook, Karl

AU - Jackson, Carole

AU - Lewis, Ian

AU - Lumsden, Stuart

AU - Maddox, Steve

AU - Madgwick, Darren S.

AU - Moody, Stephen

AU - Norberg, Peder

AU - Peterson, Bruce A.

AU - Sutherland, Will

AU - Taylor, Keith

PY - 2002/7/11

Y1 - 2002/7/11

N2 - 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 <k <0.15 h Mpc-1. If luminosity segregation operates on these scales, L* galaxies would be almost unbiased, b(L*,z = O) ≈ 0.96. These results are derived by assuming a flat ACDM 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.

AB - 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 <k <0.15 h Mpc-1. If luminosity segregation operates on these scales, L* galaxies would be almost unbiased, b(L*,z = O) ≈ 0.96. These results are derived by assuming a flat ACDM 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.

KW - Cosmic microwave background

KW - Cosmology: miscellaneous

KW - Galaxies: general

KW - Galaxies: statistics

KW - Surveys

U2 - 10.1046/j.1365-8711.2002.05485.x

DO - 10.1046/j.1365-8711.2002.05485.x

M3 - Article

SN - 1365-2966

VL - 333

SP - 961

EP - 968

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

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Keywords

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