Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-30
Mon.Not.Roy.Astron.Soc.308:459-472,1999
Astronomy and Astrophysics
Astrophysics
15 pages, 14 ps and eps figures, Latex, MNRAS, accepted
Scientific paper
10.1046/j.1365-8711.1999.02721.x
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 comparing to 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 Omega=1, H_0=100 km/sec/Mpc), alpha=-1.3, phi*=0.017. For class 1 (`early-type') we find M*=-19.6, alpha=-0.7, while for class 5 (`late-type') we find M*=-19.0, alpha=-1.7. The derived 2dF luminosity functions agree well with other recent luminosity function estimates.
Bland-Hawthorn Jonathan
Cannon Russell D.
Cole Shaun
Colless Matthew
Collins Charles Aloysius
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