Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Evolution of Ellipticals, Spirals and Irregulars: Overcoming
  Selection Bias   The Hubble Deep Fields represent our best opportunity for probing galaxy
evolution over a substantive look-back time. However as with any dataset the
HDFs are prone to selection biases. These biases are extremely severe beyond z
\~1.25 such that a meaningful interpretation of generic galaxy evolution is not
possible. We can however extract well defined volume-limited samples at z < 1.
The data are entirely consistent with passive/null-evolution for ellipticals,
spirals and irregulars however this concluion is tempered by small number
statistics. Alas stringent constraints on galaxy evolution await an order of
magnitude increase in the number of HDFs.

20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph