The 2dF Galaxy Redshift Survey: spectral types and luminosity functions

Author(s)

Folkes, Simon; Ronen, Shai; Price, Ian; Lahav, Ofer; Colless, Matthew; Maddox, Stephen J.; Deeley, Kathryn; Glazebrook, Karl; Bland-Hawthorn, Joss; Cannon, Russell D.; Cole, Shaun; Collins, Chris A.; Couch, Warrick J.; Driver, Simon P.; Dalton, Gavin B.; Efstathiou, George P.; Ellis, Richard S.; Frenk, Carlos S.; Kaiser, Nicholas; Lewis, Ian; Lumsden, Stuart L.; Peacock, John A.; Peterson, Bruce A.; Sutherland, William J.; Taylor, Keith

Available versions

Abstract

We describe the 2dF Galaxy Redshift Survey (2dFGRS) and the current status of the observations. In this exploratory paper, we apply a principal component analysis to a preliminary sample of 5869 galaxy spectra and use the two most significant components to split the sample into five spectral classes. These classes are defined by considering visual classifications of a subset of the 2dF spectra, and also by comparison with high-quality spectra of local galaxies. We calculate a luminosity function for each of the different classes and find that later-type galaxies have a fainter characteristic magnitude, and a steeper faint-end slope. For the whole sample we find M*=−19.7 (for Ω=1, H0=100 km s−1 Mpc−1), α=−1.3, φ*=0.017. For class 1 ('early-type') we find M*=−19.6, α=−0.7, while for class 5 ('late-type') we find M*=−19.0, α=−1.7. The derived 2dF luminosity functions agree well with other recent luminosity function estimates.

Publication year

1999

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 308, no. 2 (Sep 1999), pp. 459-472

ISSN

0035-8711

Publisher

Wiley

Copyright

Copyright © 1999 Royal Astronomical Society. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

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