Variations in the Bivariate Brightness Distribution with different galaxy types

Abstract

We present Bivariate Brightness Distributions (BBDs) for four spectral types discriminated by the 2dFGRS. We discuss the photometry and completeness of the 2dFGRS using a deep, wide-field CCD imaging survey. We find that there is a strong luminosity-surface brightness correlation amongst galaxies with medium to strong emission features, with gradient ${\hat{I}}_{\hat{I}}^2¼=0.25\pm 0.05$ and width $\ddot{I}{ƒ}_{\hat{I}}¼=0.56\pm 0.01$. Strong absorption line galaxies, show a bimodal distribution, with no correlation between luminosity and surface brightness.

4 pages, 2 figures, In the "New Era in Cosmology" conference, Durham, Sept 2001, ASP conference series