Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I   We report the results of a 5 GHz southern hemisphere VLBI survey of compact
extragalactic radio sources. These observations were undertaken with the SHEVE
array plus Shanghai station in November 1992. A sample of 22 sources was
observed and images of 20 of them were obtained. Of the 20 sources imaged, 15
showed core-jet structure, one had a two-sided jet and 4 had only single
compact cores. Eleven of the 16 core-jet (including one two-sided jet) sources
show some evidence of bent jets. No compact doubles were found. A comparison
with previous images and the temporal variability of the radio flux density
showed evidence for superluminal motion in 4 of the sources. Five sources were
high energy (>100 MeV) gamma-ray sources. Statistical analysis showed the
dominance of highly polarized quasars among the detected gamma-ray sources,
which emphasizes the importance of beaming effect in the gamma-ray emission.

16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph