Made-to-measure N-body systems
Made-to-measure N-body systems
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DOI：
10.1093/mnras/282.1.223
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发表时间：
1996-05
影响因子：
4.8
通讯作者：
D. Syer;S. Tremaine
中科院分区：
文献类型：
--
作者：
D. Syer;S. Tremaine
我们描述了一个算法，用于构建N体实现的平衡恒星系统。该算法补充了现有的基于轨道的建模技术，使用线性规划或其他优化算法。平衡是通过积分一个N体系统，同时缓慢地调整粒子的质量，直到时间平均密度场和其他可观测量收敛到一个指定的值。该过程可以被安排为最大化系统的熵和可观测量的统计量的线性组合。这样产生的平衡可能是有用的N体模拟或个别星系的建模观测的初始条件。
We describe an algorithm for constructing N-body realisations of equilibrium stellar systems. The algorithm complements existing orbit-based modelling techniques using linear programming or other optimization algorithms. The equilibria are constructed by integrating an N-body system while slowly adjusting the masses of the particles until the time-averaged density field and other observables converge to a prescribed value. The procedure can be arranged to maximise a linear combination of the entropy of the system and the $\chi^2$ statistic for the observables. The equilibria so produced may be useful as initial conditions for N-body simulations or for modelling observations of individual galaxies.