Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interpreting the optical data of the Hubble Deep Field South: colors,
  morphological number counts and photometric redshifts   We present an analysis of the optical data of the Hubble Deep Field South. We
derive F300W(AB), F450W(AB), F606W(AB) and F814W(AB) number counts for galaxies
in all four bands. The slope is steeper at shortest wavelengths: we estimated
gamma(F300W(AB))=0.47, gamma(F450W(AB))=0.35, gamma(F606W(AB))=0.28 and
gamma(F814W(AB))=0.28. Morphological number counts are actually dominated by
late type galaxies, while early type galaxies show a decreasing slope at faint
magnitudes. Combining this information with photometric redshifts, we notice
that galaxies contributing with a steep slope to morphological number counts
(i.e. spiral and irregular galaxies) have z>1, suggesting a moderate merging.
However we emphasize that any cut in apparent magnitude at optical wavelengths
results in samples biased against elliptical galaxies, affecting as a
consequence the redshift distributions and the implications on the evolution of
galaxies along the Hubble sequence.

34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat