论文标题
用Lamost和Gaia Red Clump样品映射银河盘。 vi：长期存在的非状态扭曲的证据
Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. VI: An evidence for the long lived non-steady warp of non-gravitational scenarios
论文作者
论文摘要
通过将Lamost DR4和Gaia DR2共同的红色团恒星与年龄和适当运动相结合，我们可以独立于使用简单模型的任何假设来分析恒星翘曲的振幅演化。经线磁盘的最大高度随着不同人群的半乳酸为中心距离增加，它取决于年龄：年轻的恒星种群比旧特征表现出更强的特征，并且伴随于扭曲振幅$γ（{\ rm age}）$ with and the and dot $ \ is age vers and and and and and and and and and and and and and and and and and cer n zerage。节点线的方位角$ ϕ_w $在$ - 5度的情况下稳定，没有明确的时间演变，这完美地证实了以前的一些作品。所有这些自洽的证据都支持我们的银河经纱很可能是长期存在的，但是非稳固的结构而不是短暂的结构，而不是瞬态的结构，支持翘曲的源自磁盘上的磁盘或其他假设，或者假设翘曲主要影响气体，从而使气体较年轻的气体比较年轻的气体相比，比老年人强。换句话说，银河经导致的磁盘模型的非重力相互作用引起了银河经。
By combining LAMOST DR4 and Gaia DR2 common red clump stars with age and proper motion, we analyze the amplitude evolution of the stellar warp independently of any assumption with a simple model. The greatest height of the warp disk increases with Galactocentric distance in different populations and it is dependent on the age: the younger stellar populations exhibit stronger warp features than the old ones, accompanied with the warp amplitude $γ({\rm age})$ decreasing with age and its first derivative $\dotγ ({\rm age})$ is different from zero. The azimuth of line of nodes $ϕ_w$ is stable at $-$5 degree without clear time evolution, which perfectly confirms some of previous works. All these self-consistent evidences support that our Galactic warp should most likely be a long lived, but non-steady structure and not a transient one, which is supporting the warp is originated from gas infall onto the disk or other hypotheses that suppose that the warp mainly affects to the gas, and consequently younger populations tracing the gas are stronger than the older ones. In other words, the Galactic warp is induced by the non-gravitational interaction over the disk models.
