论文标题
用Lamost和Gaia Red Clump样品映射银河磁盘：IV：银河翘曲的运动学特征
Mapping the Galactic disk with the LAMOST and Gaia red clump sample: IV: the kinematic signature of the Galactic warp
论文作者
论文摘要
使用从Lamost和Gaia Galactic调查中选择的近140,000个红色团星的样品，我们在$ x $ - $ y $飞机中绘制了平均的垂直速度$ \ overline {v_ {z}} $，用于大量的银河系磁盘（6 $ <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <r <16 $ kpc; $ z; KPC）。明确的签名，其中$ \叠加{v_ {z}} $增加了$ r $的增加，用于化学薄磁盘。然而，厚磁盘的签名与此磁盘分量的热性质一致。对于薄磁盘，经线签名在径向和方位角方向上都显示出显着的变化，这与先前的恒星计数结果非常吻合。将$ \ Overline {v_ {z}} $的二维分布与简单的长期静态扭曲模型相吻合，可以使这种运动纱的节点角度约为$ 12.5^{\ circ} $，再次与先前的结果一致。
Using a sample of nearly 140,000 red clump stars selected from the LAMOST and Gaia Galactic surveys, we have mapped mean vertical velocity $\overline{V_{z}}$ in the $X$-$Y$ plane for a large volume of the Galactic disk (6 $< R < 16$ kpc; $-20 <ϕ< 50^{\circ}$; $|Z| < 1$ kpc). A clear signature where $\overline{V_{z}}$ increases with $R$ is detected for the chemically thin disk. The signature for the thick disk is however not significant, in line with the hot nature of this disk component. For the thin disk, the warp signature shows significant variations in both radial and azimuthal directions, in excellent agreement with the previous results of star counts. Fitting the two-dimensional distribution of $\overline{V_{z}}$ with a simple long-lived static warp model yields a line-of-node angle for this kinematic warp of about $12.5^{\circ}$, again consistent with the previous results.
