Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectra of High Redshift Galaxies using a Cluster as a Gravitational
  Telescope   Using the Focal Reducer Spectrograph (FORS) at the Very Large Telescope (VLT)
during the FORS commissioning time in December 1998 we took long slit spectra
of the gravitational arc visible on images of the galaxy cluster 1E 0657 (z =
0.296). This cluster is one of the hottest (massive) cluster known so far and
hence perfectly acts as a gravitational telescope magnifying the flux of
background sources up to a factor of 17. Here we present the spectra of the
gravitational arc (z = 3.23) and 4 additional high redshift objects (z=2.35 to
3.09), that also fall on the slit by chance coincidence. We briefly discuss the
stellar contents of these galaxies and show first models of the observed
spectra. Furthermore we point out the effectivity of using FORS in combination
with available gravitational telescopes.

27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat