论文标题
钢筋增厚的三种机制
Three Mechanisms for Bar Thickening
论文作者
论文摘要
我们介绍了棒状恒星圆盘的模拟，其中钢筋变厚成盒子/花生形状。对每个模型的演变的详细分析揭示了三种不同的钢筋增厚机制。第一个机制是众所周知的屈曲不稳定性，第二个机制是通过2：1垂直共振的钢筋轨道垂直激发，第三个是逐渐增加的棒轨道，被困在该共振中。由于许多星系中的条可能已经形成并变厚很久以前，因此我们检查了杆中恒星速度分布的化石证据模型，发现诊断性以区分与其他两种机制弯曲的棒。
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.
