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The 2dF Galaxy Redshift Survey: Spectral Types and Luminosity Functions | | S.R. Folkes
; S. Ronen
; I. Price
; O. Lahav
; M. Colless
; S. J. Maddox
; K. E. Deeley
; K. Glazebrook
; J. Bland-Hawthorn
; R. D. Cannon
; S. Cole
; C. A. Collins
; W. J. Couch
; S. P. Driver
; G. Dalton
; G. Efstathiou
; R. S. Ellis
; C. S. Frenk
; N. Kaiser
; I. J. Lewis
; S. L. Lumsden
; J. A. Peacock
; B. A. Peterson
; W. Sutherland
; K. Taylor
; | | Date: |
30 Mar 1999 | | Subject: | astro-ph | | 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. | | Source: | arXiv, astro-ph/9903456 | | Services: | Forum | Review | PDF | Favorites | |
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