Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the kinematic signature of the Galactic warp as revealed by the
  LAMOST-TGAS data   Using a sample of about 123,000 stars with accurate 3D velocity measurements
from the LAMOST-TGAS data, we confirm the kinematic signature of the Galactic
warp found by Sch\"onrich & Dehnen recently. The data reveal a clear trend of
increasing mean vertical velocity $\overline{V_{z}}$ as a function of absolute
vertical angular momentum $L_{z}$ and azimuthal velocity $V_{\phi}$ for guiding
center radius $R_{g}$ between 6.0 and 10.5 kpc. The trend is consistent with a
large-scale Galactic warp. Similar to Sch\"onrich & Dehnen, we also find a
wave-like pattern of $\overline{V_{z}}$ versus $L_{z}$ with an amplitude of
$\sim 0.9$ km s$^{-1}$ on a scale of $\sim 2.0$ kpc, which could arise from
bending waves or a winding warp. Finally, we confirm a prominent, localized
peak in $\overline{V_z}$ near $L_z \sim 2150$ kpc km s$^{-1}$ (corresponding to
$R_{g} \sim 9$ kpc and $V_{\phi} \sim 255$ km s$^{-1}$). The additional
line-of-sight velocity information from LAMOST reveals that stars in this
feature have a large, inward radial velocity of $V_{R} \sim -13.33 \pm 0.59$ km
s$^{-1}$ and a small radial velocity dispersion $\sigma_{R} \sim 25.27 \pm
0.89$ km s$^{-1}$, suggesting that a stellar stream gives rise to this feature.

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The categories of this paper are: q-alg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn