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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, Ofer and Bridle, Sarah L. and Percival, Will J. and Peacock, John A. and Efstathiou, George and Baugh, Carlton M. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Couch, Warrick and Dalton, Gavin and De Propris, Roberto and Driver, Simon P. and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Jackson, Carole and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren S. and Moody, Stephen and Norberg, Peder and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (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). pp. 961-968. ISSN 0035-8711. doi:10.1046/j.1365-8711.2002.05485.x. https://resolver.caltech.edu/CaltechAUTHORS:20200521-161559997

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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 σ_(8m) = 0.73 ± 0.05 (after marginalization over the matter density parameter Ω_m 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 L_s = 1.9L_∗ APM-selected galaxies to be b(L_s,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=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 (Ω_m, 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1046/j.1365-8711.2002.05485.xDOIArticle
https://ui.adsabs.harvard.edu/abs/2002MNRAS.333..961L/abstractADSArticle
https://arxiv.org/abs/astro-ph/0112162arXivDiscussion Paper
ORCID:
AuthorORCID
Baugh, Carlton M.0000-0002-9935-9755
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Norberg, Peder0000-0002-5875-0440
Additional Information:© 2002 RAS. Accepted 2002 March 6. Received 2002 March 5; in original form 2001 December 12. The 2dF Galaxy Redshift Survey was made possible through the dedicated efforts of the staff of the Anglo–Australian Observatory, both in creating the 2dF instrument and in supporting it on the telescope. We thank Oystein Elgaroy, Andrew Firth and Jerry Ostriker for helpful discussions.
Subject Keywords:surveys, galaxies: general, galaxies: statistics, cosmic microwave background, cosmology: miscellaneous
Issue or Number:4
DOI:10.1046/j.1365-8711.2002.05485.x
Record Number:CaltechAUTHORS:20200521-161559997
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200521-161559997
Official Citation: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, 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, Volume 333, Issue 4, July 2002, Pages 961–968, https://doi.org/10.1046/j.1365-8711.2002.05485.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103389
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 May 2020 17:12
Last Modified:16 Nov 2021 18:21

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