Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The relative abundances of ellipticals and starbursts among the
  Extremely Red Galaxies   We present J band observations of a complete sample of 57 red galaxies
selected to have K<20 and R-K>5.3. We use the Pozzetti and Mannucci (2000)
prescriptions, based on the R-K and J-K colours, to separate the two dominant
populations, old ellipticals and dusty starbursts. We find that both
populations are present in the current sample and have similar abundances, and
discuss the uncertainties in this result. Galactic stars comprise about 9% of
the objects. The starburst galaxies of the present sample are found to give a
contribution to the cosmic star formation density similar to the Lyman-break
galaxies.

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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga