Straight segments in the galactic discs

被引：3
|
作者：
Mel'nik, A. M. [1 ]
Rautiainen, P. [2 ]
机构：
[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia
[2] Univ Oulu, Astron Div, Dept Phys, FI-90014 Oulu, Finland
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 434卷 / 02期
基金：
美国国家科学基金会; 俄罗斯基础研究基金会;
关键词：
galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure; N-BODY MODEL; SPIRAL ARMS; GALAXIES; INSTABILITIES; DYNAMICS; M51;
D O I：
10.1093/mnras/stt1098
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the properties of the straight segments forming in N-body simulations of the galactic discs. The properties of these features are consistent with the observational ones summarized by Chernin et al. Unlike some previous suggestions to explain the straight segments as gas dynamical instabilities, they form in our models in the stellar system. We suggest that the straight segments are forming as a response of the rotating disc to a gravity of the regions of enhanced density (overdensities) corotating with the disc. The kinematics of stars near the prominent overdensities is consistent with this hypothesis.
引用
收藏
页码：1362 / 1375
页数：14
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