摆动星系中周转摄动的相位包裹
Phase Wrapping of Epicyclic Perturbations in the Wobbly Galaxy
摘要：
我们使用测试粒子积分表明，由近心点通道的矮星系激发的周转运动可以解释最近在太阳附近的银河系恒星盘中观察到的批量垂直速度流运动。我们使用固定的潜在的测试粒子积分隔离的作用，相位包裹周转扰动弯曲和呼吸波或模式，这需要自引力振荡。来自一个相当大质量的人马座矮星系$M_d \sim 2.5 \times 10^{10} M_\odot$的扰动，需要解释从其轨道近心点观测到的流运动的大小。大约2.2 Gyr前的矮星系穿过银河系盘（当时有一个更大质量的矮星系）是不太有效的。如果行星摄动的相位包裹是银河系圆盘中恒星流运动的原因，那么在太阳附近应该有几kpc尺度的速度梯度变化。
英文摘要：
We use test-particle integrations to show that epicyclic motions excited by a pericentre passage of a dwarf galaxy could account for bulk vertical velocity streaming motions recently observed in the Galactic stellar disc near the Sun. We use fixed potential test-particle integrations to isolate the role of phase wrapping of epicyclic perturbations from bending and breathing waves or modes, which require self-gravity to oscillate. Perturbations from a fairly massive Sagittarius dwarf galaxy, $M_d \sim 2.5 \times 10^{10} M_\odot$, are required to account for the size of the observed streaming motions from its orbital pericentre approximately a Gyr ago. A previous passage of the dwarf through the Galactic disc approximately 2.2 Gyr ago (with a then more massive dwarf galaxy) is less effective. If phase wrapping of epicyclic perturbations is responsible for stellar streaming motions in the Galactic disc, then there should be variations in velocity gradients on scales of a few kpc in the vicinity of the Sun.
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