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

S Folkes, S Ronen, I Price, O Lahav, M Colless, S Maddox, K Deeley, K Glazebrook, J Bland-Hawthorn, R Cannon, S Cole, C Collins, W Couch, S P Driver, G Dalton, G Efstathiou, R S Ellis, C S Frenk, N Kaiser, I LewisS Lumsden, J Peacock, B A Peterson, W Sutherland, K Taylor

Research output: Contribution to journalArticlepeer-review

232 Citations (Scopus)


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 Ohm = 1, H-0 = 100 km s(-1) Mpc(-1)), 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.

Original languageEnglish
Pages (from-to)459-472
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 11 Sept 1999


  • galaxies : distances and redshifts
  • galaxies : elliptical and lenticular, cD
  • galaxies : evolution
  • galaxies : formation
  • galaxies : stellar content


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