The 2dF Galaxy Redshift Survey: the blue galaxy fraction and implications for the Butcher-Oemler effect

Author(s)

De Propris, Roberto; Colless, Matthew; Peacock, John A.; Couch, Warrick J.; Driver, Simon P.; Balogh, Michael L.; Baldry, Ivan K.; Baugh, Carlton; Bland-Hawthorn, Joss; Bridges, Terry J.; Cannon, Russell D.; Cole, Shaun; Collins, Chris A.; Cross, Nicholas J. G.; Dalton, Gavin B.; Efstathiou, George P.; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Hawkins, Edward; Jackson, C. A.; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Stephen J.; Madgwick, Darren; Norberg, Peder; Percival, Will; Peterson, Bruce A.; Sutherland, William J.; Taylor, Keith

Available versions

Abstract

We derive the fraction of blue galaxies in a sample of clusters at z < 0.11 and the general field at the same redshift. The value of the blue fraction is observed to depend on the luminosity limit adopted, cluster-centric radius and, more generally, local galaxy density, but it does not depend on cluster properties. Changes in the blue fraction are due to variations in the relative proportions of red and blue galaxies but the star formation rate for these two galaxy groups remains unchanged. Our results are most consistent with a model where the star formation rate declines rapidly and the blue galaxies tend to be dwarfs and do not favour mechanisms where the Butcher-Oemler effect is caused by processes specific to the cluster environment.

Publication year

2004

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 351, no. 1 (Jun 2004), pp. 125-132

ISSN

0035-8711

Publisher

Wiley

Copyright

Copyright © 2004 RAS.

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