修正牛顿动力学中引力扰动的气体阻力和尾流结构
Gaseous drag on a gravitational perturber in Modified Newtonian Dynamics and the structure of the wake
摘要：
本文在修正牛顿动力学（MOND）的框架下，计算了引力扰动体在均匀密度和恒定背景加速度g_ext气体介质中运动时产生的尾流结构和动力摩擦力。尾流被描述为两项的线性叠加。主要部分显示出与牛顿重力中产生的尾流相同的结构，按因子μ ^{-1}（g_ext/a_0）按比例放大，其中a_{0}是恒定MOND加速度，μ是插值函数。第二项的结构很大程度上取决于g_{ext}和之间的角度和扰动的速度。我们评估的动态阻力数值和比较我们的MOND结果与牛顿的情况下。我们提到的相关性，我们的计算轨道演化的球状星团和卫星的气体原星系。在MOND和牛顿引力与暗晕引力银河尾迹的X射线发射的电势差突出显示。
英文摘要：
We calculate the structure of a wake generated by, and the dynamical friction force on, a gravitational perturber travelling through a gaseous medium of uniform density and constant background acceleration g_ext, in the context of Modified Newtonian Dynamics (MOND). The wake is described as a linear superposition of two terms. The dominant part displays the same structure as the wake generated in Newtonian gravity scaled up by a factor mu^{-1}(g_ext/a_0), where a_{0} is the constant MOND acceleration and mu the interpolating function. The structure of the second term depends greatly on the angle between g_{ext} and and the velocity of the perturber. We evaluate the dynamical drag force numerically and compare our MOND results with the Newtonian case. We mention the relevance of our calculations to orbit evolution of globular clusters and satellites in a gaseous proto-galaxy. Potential differences in the X-ray emission of gravitational galactic wakes in MOND and in Newtonian gravity with a dark halo are highlighted.
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