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Large scale characterization of the stellar velocity distribution in the galactic disk

机译:星系盘中恒星速度分布的大规模表征

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摘要

Test particle simulations of Milky Way type galactic disks are being conducted to map the evolution of the stellar large scale kinematic response to the bar and spiral structure. Second and third order moments of the velocity distribution function prove to be good indicators of both, the velocity ellipsoid misalignment near the arms and the bar, and the degree of kinematic substructure in the UV plane, that is, the presence of moving groups. A large scale analysis all through the galactic disk allows to establish the kinematic behavior near resonances and the correlation between the kinematic parameters and properties of the non-axisymmetric components, such as its transient nature or its mass overdensity. N-body simulaions are being run in order to test these results in self-consistent models.
机译:正在对银河系银河盘进行测试粒子模拟,以绘制恒星大规模运动响应对条形和螺旋形结构的演变图。速度分布函数的二阶和三阶矩被证明是很好的指示符,可以很好地指示臂和杆附近的速度椭球未对准以及UV平面中运动子结构的程度,即运动组的存在。整个银河系盘的大规模分析允许建立共振附近的运动学行为,以及运动学参数和非轴对称组件的属性(例如其瞬态性质或质量过密度)之间的相关性。 N身体模拟正在运行,以便在自洽模型中测试这些结果。

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