论文标题
倾斜，富含气，直接星系碰撞的飞溅桥模型
Splash Bridge Models of Inclined, Gas-Rich, Direct Galaxy Collisions
论文作者
论文摘要
飞溅桥是由富含气体星系的直接非弹性碰撞形成的。 Taffy星系（UGC 12914/15）最近的多波长观察结果显示了桥梁中复杂的气体结构。我们通过添加：调整气盘相对倾斜度的能力，随着时间的推移跟踪云云碰撞以及其他冷却过程的能力，升级了Yeager等人，2019年的粘性粒子仿真代码。倾斜效应导致各种形态学特征，包括从较小的银河盘中剥离的气体丝流。圆盘中心处的偏移决定了这些流沿单个方向或多个方向流动，甚至横向至两个星系的运动。我们还发现，在许多类型的直接碰撞中，与倾斜度或偏移无关，碰撞云中加权马赫数和冲击速度的分布放松到非常相似的形式。有充分的证据表明，由于持续的云碰撞，每个飞溅桥的气体的湍流延长，用于所有测试的倾向和偏移，这反过来又是剪切和差异加速轨迹的结果。在我们低倾斜模型中产生的云碰撞中高速冲击的数量分布与Alma，Appleton等人，2019年在Taffy星系中观察到的那些一致。
Splash bridges are formed from the direct inelastic collision of gas-rich galaxies. Recent multi-wavelength observations of the Taffy galaxies, UGC 12914/15, have revealed complicated gas structures in the bridge. We have upgraded the sticky particle simulation code of Yeager et al., 2019, by adding: the ability to adjust the relative inclination of the gas discs, the ability to track cloud-cloud collisions over time, and additional cooling processes. Inclination effects lead to various morphological features, including filamentary streams of gas stripped from the smaller galactic disc. The offset of disc centres at impact determines whether or not these streams flow in a single direction or multiple directions, even transverse to the motion of the two galaxies. We also find that, across many types of direct collision, independent of the inclination or offset, the distributions of weighted Mach numbers and shock velocities in colliding clouds relax to a very similar form. There is good evidence of prolonged turbulence in the gas of each splash bridge for all inclinations and offsets tested, as a result of continuing cloud collisions, which in turn are the result of shearing and differentially accelerated trajectories. The number distribution of high velocity shocks in cloud collisions, produced in our low inclination models, are in agreement with those observed in the Taffy Galaxies with ALMA, Appleton et al., 2019.
