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The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies

Cross, Nicholas and Driver, Simon P. and Couch, Warrick and Baugh, Carlton M. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Dalton, Gavin and Deeley, Kathryn and De Propris, Roberto and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Jackson, Carole and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren and Moody, Stephen and Norberg, Peder and Peacock, John A. and Peterson, Bruce A. and Price, Ian and Seaborne, Mark and Sutherland, Will and Tadros, Helen and Taylor, Keith (2001) The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies. Monthly Notices of the Royal Astronomical Society, 324 (4). pp. 825-841. ISSN 0035-8711. doi:10.1046/j.1365-8711.2001.04254.x.

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We present the bivariate brightness distribution (BBD) for the 2dF Galaxy Redshift Survey (2dFGRS) based on a preliminary subsample of 45 000 galaxies. The BBD is an extension of the galaxy luminosity function, incorporating surface brightness information. It allows the measurement of the local luminosity density, jʙ, and of the galaxy luminosity and surface brightness distributions, while accounting for surface brightness selection biases. The recovered 2dFGRS BBD shows a strong luminosity–surface brightness relation Mʙ∝(2.4±₀.₅¹.⁵)μₑ], providing a new constraint for galaxy formation models. In terms of the number density, we find that the peak of the galaxy population lies at Mʙ≥−16.0 mag. Within the well-defined selection limits (−24<Mʙ<−16.0 mag,18.0<μₑ<24.5 mag arcsec−²) the contribution towards the luminosity density is dominated by conventional giant galaxies (i.e., 90 per cent of the luminosity density is contained within −22.5<M<−17.5,18.0<μₑ<23.0). The luminosity-density peak lies away from the selection boundaries, implying that the 2dFGRS is complete in terms of sampling the local luminosity density, and that luminous low surface brightness galaxies are rare. The final value we derive for the local luminosity density, inclusive of surface brightness corrections, is jʙ = 2.49±0.20×108 h₁₀₀ L⊙ Mpc−³. Representative Schechter function parameters are M*=−19.75±0.05,φ* = 2.02±0.02×10−² and α=−1.09±0.03. Finally, we note that extending the conventional methodology to incorporate surface brightness selection effects has resulted in an increase in the luminosity density of ∼37 per cent. Hence surface brightness selection effects would appear to explain much of the discrepancy between previous estimates of the local luminosity density.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
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:© 2001 RAS. Accepted 2000 December 3. Received 2000 November 23; in original form 2000 May 18. The data shown here were obtained via the two-degree field facility on the 3.9-m Anglo-Australian Observatory. We thank all those involved in the smooth running and continued success of the 2dF and the AAO.
Subject Keywords:surveys, galaxies: distances and redshifts, galaxies: general, galaxies: luminosity function, mass function
Issue or Number:4
Record Number:CaltechAUTHORS:20200629-094519018
Persistent URL:
Official Citation:Nicholas Cross, Simon P. Driver, Warrick Couch, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Gavin Dalton, Kathryn Deeley, Roberto de Propris, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren Madgwick, Stephen Moody, Peder Norberg, John A. Peacock, Bruce A. Peterson, Ian Price, Mark Seaborne, Will Sutherland, Helen Tadros, Keith Taylor, The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies, Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 4, July 2001, Pages 825–841,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104121
Deposited By: Rebecca Minjarez
Deposited On:29 Jun 2020 18:04
Last Modified:16 Nov 2021 18:28

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