论文标题
以银河系的旋转轴对齐方式的发现球状簇
Discovery of rotation axis alignments in Milky Way globular clusters
论文作者
论文摘要
最近的观察结果越来越多，这些结果表明，某些球状簇在银河系中心沿轨道轨迹行驶时表现出内部旋转。基于这些发现，我们寻找了相对于银河系平面和它们旋转的旋转轨道的倾斜角度之间的任何关系。我们发现，在意义上，相对倾斜轴倾斜 - 轨道轴倾斜，是球形簇的轨道倾斜度的函数。将旋转和轨道轴排列为〜56维的倾斜度，而旋转轴的倾斜度远非距离轨道的距离距离为〜20摄氏度和-20DEG，而后者则从0摄氏度增加到90度。我们进一步研究了这种线性关系的起源，发现与球状簇轨道的半轴轴和偏心无关，也与内部旋转强度，球状簇的大小，实际和潮湿的质量，实际和潮汐破坏的质量，半质量的放松时间等。未覆盖的关系将影响球状簇内部旋转的数值模拟的发展，我们对球状簇与银河系重力场相互作用的理解，以及增加研究的球形簇与检测到的内部旋转的观察运动。
There is an increasing number of recent observational results which show that some globular clusters exhibit internal rotation while they travel along their orbital trajectories around the Milky Way center. Based on these findings, we looked for any relationship between the inclination angles of the globular clusters' orbits with respect to the Milky Way plane and those of their rotation. We discovered that the relative inclination, in the sense rotation axis inclination - orbit axis inclination, is a function of the globular cluster's orbit inclination. Rotation and orbit axes are aligned for an inclination of ~ 56deg, while the rotation axis inclination is far from the orbit's one between ~ 20deg and -20deg when the latter increases from 0deg up to 90deg. We further investigated the origin of such a linear relationship and found no correlation with the semimajor axes and eccentricities of the globular clusters' orbits, nor with the internal rotation strength, the globular clusters' sizes, actual and tidally disrupted masses, half-mass relaxation times, among others. The uncovered relationship will impact on the development of numerical simulations of the internal rotation of globular clusters, on our understanding about the interaction of the globular clusters with the Milky Way gravitational field, and on the observational campaigns for increasing the number of studied globular clusters with detected internal rotation.
