Global N-body simulation of galactic spiral arms

Global N-body simulation of galactic spiral arms
复制标题

银河旋臂的全局N体模拟

DOI:
10.1093/mnras/sty2274
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发表时间:
2018
影响因子:
4.8
通讯作者:
Eiichiro
Eiichiro
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Michikoshi;Shugo; Kokubo;Eiichiro

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星系旋臂的起源是天体物理学的基本问题之一。Toomre在局域分析的基础上提出了摆动放大机制,即由于星系切变,恒星的前导波旋转到拖尾波,自引力形成旋臂。螺旋臂的结构特征在于其数量和螺旋角。我们对旋涡星系进行了全局N体模拟,研究了旋涡结构对盘参数的依赖性,并将模拟结果与摆动放大模型进行了比较。我们发现,在theN-body模拟的螺旋结构同意与预测的摆动放大的参数范围很广。螺旋角随剪切速率的增加而减小,与圆盘质量分数无关。螺旋臂的数目随着剪切速率和圆盘质量分数的增加而减少。如果盘的质量分数是固定的,螺旋角的螺旋臂的数量增加。
The origin of galactic spiral arms is one of the fundamental problems in astrophysics. Based on the local analysis, Toomre proposed the swing amplification mechanism in which the self-gravity forms spiral arms as leading waves of stars rotate to trailing ones due to galactic shear. The structure of spiral arms is characterized by their number and pitch angle. We perform globalN-body simulations of spiral galaxies to investigate the dependence of the spiral structure on disc parameters and compare the simulation results with the swing amplification model. We find that the spiral structure in theN-body simulations agrees well with that predicted by the swing amplification for the wide range of parameters. The pitch angle decreases with increasing the shear rate and is independent of the disc mass fraction. The number of spiral arms decreases with both increasing the shear rate and the disc mass fraction. If the disc mass fraction is fixed, the pitch angle increases with the number of spiral arms.
DOI: 10.3847/0004-637x/821/1/35
发表时间: 2016
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: E. Kokubo
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DOI: --
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影响因子: 2.3
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