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The 2dF Galaxy Redshift Survey: the luminosity function of cluster galaxies

De Propris, Roberto and Colless, Matthew and Driver, Simon P. and Couch, Warrick and Peacock, John A. and Baldry, Ivan K. and Baugh, Carlton M. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Collins, Chris and Cross, Nicholas and Dalton, Gavin B. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Hawkins, Edward and Jackson, Carole and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Maddox, Steve and Madgwick, Darren S. and Norberg, Peder and Percival, Will and Peterson, Bruce and Sutherland, Will and Taylor, Keith (2003) The 2dF Galaxy Redshift Survey: the luminosity function of cluster galaxies. Monthly Notices of the Royal Astronomical Society, 342 (3). pp. 725-737. ISSN 0035-8711. doi:10.1046/j.1365-8711.2003.06510.x.

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We have determined the composite luminosity function (LF) for galaxies in 60 clusters from the 2dF Galaxy Redshift Survey. The LF spans the range −22.5 < M_(bj) < −15, and is well fitted by a Schechter function with M∗_(bJ) = −20.07 ± 0.07 and α = −1.28 ± 0.03 (H₀ = 100 km s⁻¹ Mpc⁻¹, Ω_M = 0.3, Ω_Λ = 0.7). It differs significantly from the field LF, having a characteristic magnitude that is approximately 0.3 mag brighter and a faint-end slope that is approximately 0.1 steeper. There is no evidence for variations in the LF across a wide range of cluster properties: the LF is similar for clusters with high and low velocity dispersions, for rich and poor clusters, for clusters with different Bautz–Morgan types, and for clusters with and without substructure. The core regions of clusters differ from the outer parts, however, in having an excess of very bright galaxies. We also construct the LFs for early (quiescent), intermediate and late (star-forming) spectral types. We find that, as in the field, the LFs of earlier-type galaxies have brighter characteristic magnitudes and shallower faint-end slopes. However, the LF of early-type galaxies in clusters is both brighter and steeper than its field counterpart, although the LF of late-type galaxies is very similar. The trend of faint-end slope with spectral type is therefore much less pronounced in clusters than in the field, explaining why variations in the mixture of types do not lead to significant differences in the cluster LFs. The differences between the field and cluster LFs for the various spectral types can be qualitatively explained by the suppression of star formation in the dense cluster environment, together with mergers to produce the brightest early-type galaxies.

Item Type:Article
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URLURL TypeDescription Paper
Colless, Matthew0000-0001-9552-8075
Baugh, Carlton M.0000-0002-9935-9755
Bland-Hawthorn, Joss0000-0001-7516-4016
Ellis, Richard S.0000-0001-7782-7071
Norberg, Peder0000-0002-5875-0440
Additional Information:© 2003 RAS. Accepted 2003 February 6. Received 2003 January 29; in original form 2002 September 1. We would like to thank the referee, Stefano Andreon, for a number of suggestions which have improved the content of this paper. We also thank Daniel Christlein and Ann Zabludoff for having shown us their results in advance of submission. RDP and WJC acknowledge funding from the Australian Research Council for this work. We are indebted to the staff of the Anglo-Australian Observatory for their tireless efforts and assistance in supporting 2dF throughout the course of the survey. We are also grateful to the Australian and UK time assignment committees for their continued support for this project.
Funding AgencyGrant Number
Australian Research CouncilUNSPECIFIED
Subject Keywords:galaxies: formation, galaxies: luminosity function, mass function
Issue or Number:3
Record Number:CaltechAUTHORS:20200708-151732985
Persistent URL:
Official Citation:Roberto de Propris, Matthew Colless, Simon P. Driver, Warrick Couch, John A. Peacock, Ivan K. Baldry, Carlton M. Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Chris Collins, Nicholas Cross, Gavin B. Dalton, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Edward Hawkins, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Steve Maddox, Darren S. Madgwick, Peder Norberg, Will Percival, Bruce Peterson, Will Sutherland, Keith Taylor, The 2dF Galaxy Redshift Survey: the luminosity function of cluster galaxies, Monthly Notices of the Royal Astronomical Society, Volume 342, Issue 3, July 2003, Pages 725–737,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104286
Deposited By: Rebecca Minjarez
Deposited On:09 Jul 2020 15:33
Last Modified:16 Nov 2021 18:30

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