The Bivariate Brightness Distribution of Galaxies as a Function of Spectral Type.

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Bivariate Brightness Distribution (BBD) is the space density of galaxies as a function of absolute magnitude and effective surface brightness. We have measured the BBD for 4 different spectral types identified in the 2dFGRS. These spectral types range from strong absorption (type 1) to strong emission (type 4). We find that type 1 galaxies have a bounded distribution with little or no correlation between luminosity and surface brightness. Types 2 to 4 have unbound distributions (i.e. the space density is still increasing at the limits of the survey) and have strong luminosity-surface brightness correlations. The gradient β , where (M=β μ e+C), and scatter σ of this correlation appear to be constant for the 3 spectral types, with β =0.23+/-0.09 and σ = 0.56+/-0.01. This work was supported by the UK Particle Physics and Astronomy Research Council.

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