Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Caught in the act: The identification of the galaxies responsible for
  the faint blue excess   We summarise recent Hubble Space Telescope results on the morphology of faint
field galaxies. Our two principle results are: (1) the galaxies responsible for
the faint blue excess have late-type/irregular morphology and (2) the number
counts of normal galaxies, ellipticals and early-type spirals, are well fit by
standard no-evolution models implying that the giant population was in place
and mature by a redshift of $\ge 0.7$.

29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th