论文标题
观察到的年龄梯度以银河系的方式 - 作为螺旋臂结构理论的测试
The Observed Age Gradient in the Milky Way -- as a Test for theories of spiral arm structure
论文作者
论文摘要
在这里，使用了银河系获得的观测数据，在此测试了从4个主要模型形成的主要模型的一些重要预测。许多螺旋臂模型（密度波，潮汐，核Lyapunov管或动态瞬态波）在某些观测值和一些不一致方面具有一致性。我们的4个测试由不同的手臂示踪剂的相对位置和相对速度和相对速度组成，以及在两个银河象限和几个银河半径上获得的全球臂螺距角度，以及手臂的连续性以及从银河象限iv到银河象限的形状的连续性，从半乳突象限I.在Miltky the Mildky the Mildky the Artient Arm中，有1个。 Myrs/kpc，或距76 +/- 10 km/s的尘埃车道的相对速度。年龄梯度的存在由密度波预测，但与潮汐，核Lyapunov管的预测以及动态瞬态复发性波不一致。
Some important predictions from 4 main models of spiral arm formation are tested here, using observational data acquired for the Milky Way galaxy. Many spiral arm models (density wave, tidal wave, nuclear Lyapunov tube, or dynamic transient wave) have some consistencies with some of the observations, and some inconsistencies. Our 4 tests consist of the relative locations and relative speeds of different arm tracers away from the dust lane, and the global arm pitch angle as obtained over two Galactic quadrants and several Galactic radii, as well as the arm's continuity of shape from Galactic quadrant IV to Galactic quadrant I. In the Milky Way, an age gradient is observed from different arm tracers, amounting to 12.9 +/-1.1 Myrs/kpc, or a relative speed away from the dust lane of 76 +/-10 km/s. The presence of an age gradient is predicted by the density waves, but is not consistent with the predictions of the tidal waves, of the nuclear Lyapunov tubes, nor of the dynamic transient recurrent waves.
