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The 2dF Galaxy Redshift Survey: Galaxy luminosity functions per spectral type | | D.S. Madgwick
; O. Lahav
; I.K. Baldry
; C.M. Baugh
; J. Bland-Hawthorn
; T. Bridges
; R. Cannon
; S. Cole
; M. Colless
; C. Collins
; W. Couch
; G. Dalton
; R. De Propris
; S.P. Driver
; G. Efstathiou
; R.S. Ellis
; C.S. Frenk
; K. Glazebrook
; C. Jackson
; I. Lewis
; S. Lumsden
; S. Maddox
; P. Norberg
; J.A. Peacock
; B.A. Peterson
; W. Sutherland
; K. Taylor
; | | Date: |
11 Jul 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 333 (2002) 133 | | Subject: | astro-ph | | Affiliation: | Cambridge | | Abstract: | We calculate the optical bj luminosity function of the 2dF Galaxy Redshift Survey (2dFGRS) for different subsets defined by their spectral properties. These spectrally selected subsets are defined using a new parameter, eta, which is a linear combination of the first two projections derived from a Principal Component Analysis. This parameter eta identifies the average emission and absorption line strength in the galaxy rest-frame spectrum and hence is a useful indicator of the present star formation. We use a total of 75,000 galaxies in our calculations, chosen from a sample of high signal-to-noise ratio, low redshift galaxies observed before January 2001. We find that there is a systematic steepening of the faint end slope (alpha) as one moves from passive (alpha = -0.54) to active (alpha = -1.50) star-forming galaxies, and that there is also a corresponding faintening of the rest-frame characteristic magnitude M* - 5log_10(h) (from -19.6 to -19.2). We also show that the Schechter function provides a poor fit to the quiescent (Type 1) LF for very faint galaxies (M - 5log_10(h) fainter than -16.0), perhaps suggesting the presence of a significant dwarf population. The luminosity functions presented here give a precise confirmation of the trends seen previously in a much smaller preliminary 2dFGRS sample, and in other surveys. We also present a new procedure for determining self-consistent K-corrections and investigate possible fibre-aperture biases. | | Source: | arXiv, astro-ph/0107197 | | Services: | Forum | Review | PDF | Favorites | |
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