Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blue horizontal branch stars in the Sloan Digital Sky Survey: II.
  Kinematics of the Galactic halo   We carry out a maximum-likelihood kinematic analysis of a sample of 1170 blue
horizontal branch (BHB) stars from the Sloan Digital Sky Survey presented in
Sirko et al. (2003) (Paper I). Monte Carlo simulations and resampling show that
the results are robust to distance and velocity errors at least as large as the
estimated errors from Paper I. The best-fit velocities of the Sun (circular)
and halo (rotational) are 245.9 +/- 13.5 km/s and 23.8 +/- 20.1 km/s but are
strongly covariant, so that v_0 - v_halo = 222.1 +/- 7.7 km/s. If one adopts
standard values for the local standard of rest and solar motion, then the halo
scarcely rotates. The velocity ellipsoid inferred for our sample is much more
isotropic [(sigma_r,sigma_theta,sigma_phi) = (101.4 +/- 2.8, 97.7 +/- 16.4,
107.4 +/- 16.6) km/s] than that of halo stars in the solar neighborhood, in
agreement with a recent study of the distant halo by Sommer-Larsen et al.
(1997). The line-of-sight velocity distribution of the entire sample, corrected
for the Sun's motion, is accurately gaussian with a dispersion of 101.6 +/- 3.0
km/s.

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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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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: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: cs
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The categories of this paper are: eess