Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Luminosity-Diameter Relations for Globular Clusters and Dwarf Spheroidal
  Galaxies   It is shown that globular clusters and the dwarf spheroidal companions of the
Galaxy have a different distribution of flattening values, and appear to occupy
adjacent regions of the M_v versus log R_h plane that can be separated by what
will be referred to as the Shapley line. Surprisingly, typical dwarf spheroidal
companions to the Milky Way System are fainter than the average Galactic
globular cluster.

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The categories of this paper are: hep-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn