Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Restrictions to the galaxy evolutionary models from the Hawaiian Deep
  Fields SSA13 and SSA22   Quantitative structural analysis of the galaxies present in the Hawaiian Deep
Fields SSA13 and SSA22 is reported. The structural parameters of the galaxies
have been obtained automatically by fitting a two-component model (Sersic
r^{1/n} bulge and exponential disc) to the surface brightness of the galaxies.
The galaxies were classified on the basis of the bulge-to-total luminosity
ratio (B/T). The magnitude selection criteria and the reliability of our method
have been checked by using Monte Carlo simulations. A complete sample of
objects up to redshift 0.8 has been achieved. Spheroidal objects (E/S0)
represent ~33% and spirals ~41% of the total number of galaxies, while mergers
and unclassified objects represent ~26%. We have computed the comoving space
density of the different kinds of objects. In an Einstein-de Sitter universe a
decrease in the comoving density of E/S0 galaxies is observed as redshift
increases (a ~30% less at z=0.8), while for spiral galaxies a relatively quiet
evolution is reported. The framework of hierarchical clustering evolution
models of galaxies seems to be the most appropriate to explain our results.

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph