Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GAIA Galaxy Survey: a multi-colour galaxy survey with GAIA   The performance expected from a galaxy survey to be carried out with GAIA,
the GAIA Galaxy Survey, is outlined. From a statistical model of galaxy number
density, size and surface brightness distribution, and from detailed numerical
simulations based on real images, it is conservatively estimated that GAIA
would be able to detect and observe about 3 million galaxies brighter than $V
\simeq 17$ and to provide multi-colour and multi-epoch broad-band photometry of
these with an end-of-mission angular resolution of $\simeq$ 0.35 \as and a
photometric accuracy of $simeq$ 0.2 {mag/arcsec$^2$} at $\mu_V = 20$
{mag/arcsec$^2$}. The substantial scientific case for performing such a survey
and the additional efforts required in terms of mission preparation, operations
and telemetry are also discussed.

24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg