The 2dF Galaxy Redshift Survey: Spectral Types and Luminosity Functions
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 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.
Cite
@article{arxiv.astro-ph/9903456,
title = {The 2dF Galaxy Redshift Survey: Spectral Types and Luminosity Functions},
author = {S. R. Folkes and S. Ronen and I. Price and O. Lahav and M. Colless and S. J. Maddox and K. E. Deeley and K. Glazebrook and J. Bland-Hawthorn and R. D. Cannon and S. Cole and C. A. Collins and W. J. Couch and S. P. Driver and G. Dalton and G. Efstathiou and R. S. Ellis and C. S. Frenk and N. Kaiser and I. J. Lewis and S. L. Lumsden and J. A. Peacock and B. A. Peterson and W. Sutherland and K. Taylor},
journal= {arXiv preprint arXiv:astro-ph/9903456},
year = {2008}
}
Comments
15 pages, 14 ps and eps figures, Latex, MNRAS, accepted