Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broken degeneracies: the rotation curve and velocity anisotropy of the
  Milky Way halo   We use distant Blue Horizontal Branch stars with Galactocentric distances 16
< r/kpc < 48 as kinematic tracers of the Milky Way dark halo. We model the
tracer density as an oblate, power-law embedded within a spherical power-law
potential. Using a distribution function method, we estimate the overall
power-law potential and the velocity anisotropy of the halo tracers. We measure
the slope of the potential to be gamma ~ 0.4 and the overall mass within 50 kpc
is ~ 4 x 10^11 M_sol. The tracer velocity anisotropy is radially biased with
beta ~ 0.5, which is in good agreement with local solar neighbourhood studies.
Our results provide an accurate outer circular velocity profile for the Milky
Way and suggest a relatively high concentration dark matter halo (c_vir ~ 20).

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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat