星系盘中的直线段
Straight segments in the galactic discs
摘要：
我们研究了星系盘N体模拟中直线段的性质。这些特征的性质与Chernin等人（2001年）总结的观测特征一致。不像以前的一些建议，解释为气体动力学不稳定性的直线段，他们在我们的模型中形成的恒星系统。我们认为，直段的形成是旋转盘对与盘同向旋转的密度增强（超密度）区域的重力的响应。显著高密度附近恒星的运动学与这一假设是一致的。
英文摘要：
We study the properties of the straight segments forming in N-body simulations of the galactic discs. The properties of these features are consistent with the observational ones summarized by Chernin at al. (2001). Unlike some previous suggestions to explain the straight segments as gas dynamical instabilities, they form in our models in the stellar system. We suggest that the straight segments are forming as a response of the rotating disc to a gravity of the regions of enhanced density (overdensities) corotating with the disc. The kinematics of stars near the prominent overdensities is consistent with this hypothesis.
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