Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Globular Cluster System of NGC 1399. II. Kinematics of a Large
  Sample of Globular Clusters   We study the kinematics and dynamics of the globular cluster system of NGC
1399, the central galaxy of the Fornax cluster. The observational data consists
of medium resolution spectra, obtained at the Very Large Telescope. Our sample
comprises 468 radial velocities in the magnitude range 20 < m_R < 23. This is
the largest sample of globular cluster velocities around any galaxy obtained so
far. The radial range is 2 arcmin < r < 9 arcmin, corresponding to 11 kpc to 50
kpc of galactocentric distance. There is the possibility that unbound clusters
and/or objects in the foreground contaminate the NGC 1399 cluster sample. Under
strong error selection, practically no objects are found with velocities lower
than 800 km/s or higher than 2000 km/s. Since the extreme velocities influence
the velocity dispersion considerably, uncertainty regarding the exact value of
the dispersion remains. Within the above velocity limits, we derive a projected
velocity dispersion for the total sample of 274+-9 km/s which within the
uncertainties remains constant over the entire radial range. Without any
velocity restriction, it increases to 325 km/s. Blue and red clusters show
different dispersions corresponding to their different surface density
profiles. Spherical models point to a circular velocity of 415+-30$ km/s,
assuming isotropy for the red clusters. This value is constant out to 40 kpc.
The inferred dark halo potential can be well represented by a logarithmic
potential. Also a halo of the NFW type fits well to the observations. Some mass
profiles derived from X-ray analyses do not agree with a constant circular
velocity within our radial range, irrespective of its exact value.

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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc