论文标题
麦哲伦系统及其建模的教训
Lessons from the Magellanic System and its modeling
论文作者
论文摘要
占主导地位的Hi Sky的著名麦哲伦流提供了诱人的观察，这些观察结果可能会限制麦哲伦云和银河系郊区。在这里，我们表明“ Ram-Pressure Plus Collision”模型自然解释了这些属性，并能够预测该模型后做出的一些最新观察结果。其中包括在麦哲伦桥上恒星种群的复杂性，对此运动，年龄和距离进行了良好的测量，以及北部潮汐臂，该模型可以预测其从银河系潮汐力中形成。看来，这种过度约束的模型为研究流属性提供了良好的途径。这与仅复制流的主要特性的一半的潮汐模型形成鲜明对比，特别是潮汐尾巴无法再现观察到的扭转型细丝，并且其气体含量不足以提供与流相关的大量HI和HII气体。尽管做出了重现云层带来的大量气体的努力，但似乎无法预见到潮汐模型的可行解决方案。由于“ Ram-Pressure Plus Collision”模型没有成功的大型麦哲伦云质量超过2 $ \ times10^{10} $ $ m _ {\ odot} $，因此我们认为需要低质量来形成流。
The prominent Magellanic Stream that dominates the HI sky provides a tantalizing number of observations that potentially constrains the Magellanic Clouds and the Milky Way outskirts. Here we show that the 'ram-pressure plus collision' model naturally explain these properties, and is able to predict some of the most recent observations made after the model was made. These include the complexity of the stellar populations in the Magellanic Bridge, for which kinematics, ages, and distances are well measured, and the North Tidal Arm, for which the model predicts its formation from the Milky Way tidal forces. It appears that this over-constrained model provides a good path to investigate the Stream properties. This contrasts with tidal models that reproduce only half of the Stream's main properties, in particular a tidal tail cannot reproduce the observed inter-twisted filaments, and its gas content is not sufficiently massive to provide the large amount of HI and HII gas associated to the Stream. Despite the efforts made to reproduce the large amounts of gas brought by the Clouds, it seems that no viable solution for the tidal model could be foreseen. Since the 'ram-pressure plus collision' model has not succeeded for a Large Magellanic Cloud mass above 2 $\times10^{10}$ $M_{\odot}$, we conjecture that a low mass is required to form the Stream.
