Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematic response of the outer stellar disk to a central bar   We study, using direct orbit integrations, the kinematic response of the
outer stellar disk to the presence of a central bar, as in the Milky-Way. We
find that the bar's outer Lindblad resonance (OLR) causes significant
perturbations of the velocity moments. With increasing velocity dispersion, the
radius of these perturbations is shifted outwards, beyond the nominal position
of the OLR, but also the disk becomes less responsive. If we follow Dehnen
(2000) in assuming that the OLR occurs just inside the Solar circle and that
the Sun lags the bar major axis by ~20 degrees, we find (1) no significant
radial motion of the local standard of rest (LSR), (2) a vertex deviation of
\~10 degrees and (3) a lower ratio sigma_2/sigma_1 of the principal components
of the velocity- dispersion tensor than for an unperturbed disk. All of these
are actually consistent with the observations of the Solar-neighbourhood
kinematics. Thus it seems that at least the lowest-order deviations of the
local-disk kinematics from simple expectations based on axisymmetric
equilibrium can be attributed entirely to the influence of the Galactic bar.

1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci