Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic Nuclei Activity Sustained by Globular Cluster Mass Accretion   The decay of globular clusters to the center of their mother galaxy
corresponds to carrying a quantity of mass sufficient to sustain the
gravitational activity of a small pre-existing nucleus and to accrete it in a
significant way. This is due to both dynamical friction of field stars and
tidal disruption by the compact nucleus. The results of the simplified model
presented here show that the active galactic nuclei luminosity and lifetime
depend on the characteristics of the globular cluster system and are quite
insensitive to the nucleus' initial mass.

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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph