Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Influence of Black Hole Mass and Accretion Rate on the FRI/FRII
  Radio Galaxy Dichotomy   We use medium resolution optical spectra of 3CR radio galaxies to estimate
their black hole masses and accretion rates. Black hole masses are found from
central stellar velocity dispersions and accretion rates are derived from
narrow emission-line luminosities. The sample covers both Fanaroff-Riley (FR)
classes; the more powerful FRIIs and the less powerful FRIs. We find that FRIs
and FRIIs separate in diagrams of black hole mass versus radio luminosity and
narrow-line luminosity. This suggests that, at a given black hole mass, the
FRIIs accrete more efficiently, or accrete more matter, than FRIs.

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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th