钢筋加厚的三种机理
Three Mechanisms for Bar Thickening
摘要：
我们提出了模拟酒吧不稳定的恒星光盘中的酒吧成盒/花生形状。详细分析每个模型的演变，揭示了三种不同的机制增厚酒吧。第一种机制是众所周知的屈曲不稳定性，第二种是通过2：1垂直共振通道的杆轨道的垂直激励，第三种是逐渐增加的杆轨道被困在这个共振的分数。由于许多星系中的棒可能在很久以前就已经形成并变厚了，我们已经检查了棒中恒星速度分布的化石证据模型，找到了一种诊断方法来区分已经弯曲的棒与其他两种机制。
英文摘要：
We present simulations of bar-unstable stellar discs in which the bars thicken into box/peanut shapes. Detailed analysis of the evolution of each model revealed three different mechanisms for thickening the bars. The first mechanism is the well-known buckling instability, the second is the vertical excitation of bar orbits by passage through the 2:1 vertical resonance, and the third is a gradually increasing fraction of bar orbits trapped into this resonance. Since bars in many galaxies may have formed and thickened long ago, we have examined the models for fossil evidence in the velocity distribution of stars in the bar, finding a diagnostic to discriminate between a bar that had buckled from the other two mechanisms.
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