论文标题
从盖亚EDR3中的运动学热星推断出的银河条共振
Galactic Bar Resonances Inferred from Kinematically Hot Stars in Gaia EDR3
论文作者
论文摘要
使用对孤立的禁止的圆盘银河系的数值模拟，我们首先证明了内部条结构的共振在运动空间较热的恒星的动作空间分布中更为突出的特征，这些恒星对局部扰动的敏感性较小，例如瞬时螺旋臂。然后，我们分析从Gaia EDR3数据中选择的运动型恒星的动作分布，作为具有较高径向和垂直作用值的恒星。我们在角动量分布中发现了几个共振特征，包括两个新功能，类似于我们的数值模拟中所见。我们表明，条模式的速度约为$ω_ {\ rm bar} \ sim34 $ 〜km〜s $^{ - 1} $ 〜kpc $^{ - 1} $和42〜km〜S $^{ - 1} $ 〜kpc $^kpc $^{ - 1} $ quistance All sully sully这些功能。我们发现的共振特征对应于内部4：1，联合旋转，外4：1，外部lindblad和外部4：3（联合旋转，外4：1，外部4：1，外部4：3和外部1：1）谐振，当$ω_ {\ rm bar} \ rm bar} \ sim34 $（42）$（42）假设。
Using a numerical simulation of an isolated barred disc galaxy, we first demonstrate that the resonances of the inner bar structure induce more prominent features in the action space distribution for the kinematically hotter stars, which are less sensitive to the local perturbation, such as the transient spiral arms. Then, we analyse the action distribution for the kinematically hotter stars selected from the Gaia EDR3 data as the stars with higher values of radial and vertical actions. We find several resonance features, including two new features, in the angular momentum distribution similar to what are seen in our numerical simulations. We show that the bar pattern speeds of about $Ω_{\rm bar}\sim34$~km~s$^{-1}$~kpc$^{-1}$ and 42~km~s$^{-1}$~kpc$^{-1}$ explain all these features equally well. The resonance features we find correspond to the inner 4:1, co-rotation, outer 4:1, outer Lindblad and outer 4:3 (co-rotation, outer 4:1, outer Lindblad, outer 4:3 and outer 1:1) resonances, when $Ω_{\rm bar}\sim34$ (42) km~s$^{-1}$~kpc$^{-1}$ is assumed.
