Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variations in the Bivariate Brightness Distribution with different
  galaxy types   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 $\beta_{\mu}=0.25\pm0.05$ and width
$\sigma_{\mu}=0.56\pm0.01$. Strong absorption line galaxies, show a bimodal
distribution, with no correlation between luminosity and surface brightness.

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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: cs