Jeans instability criterion modified by external tidal field
Jeans instability criterion modified by external tidal field
复制标题
外部潮汐场修正的牛仔裤不稳定性判据
DOI：
10.1093/mnrasl/slt077
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发表时间：
2013
影响因子：
4.8
通讯作者：
C. Jog
中科院分区：
文献类型：
--
作者：
C. Jog
著名的金斯判据描述了在无限大的、均匀的、由压力支撑的自引力介质中不稳定性的开始。然而，大多数现实的天体物理系统并不是孤立的-相反，它们受到外部场的影响，例如由于邻居的潮汐场。在这里，我们做了一个系统在外场的线性扰动分析，并获得了一个广义色散关系，依赖于波数，声速和潮汐场的大小。一个典型的，破坏性的潮汐场，使系统更稳定的扰动，并导致更高的有效金斯波长。可以变得不稳定的最小质量比通常的金斯质量更高（超级金斯）。相反，在压缩潮汐场中，即使质量较低，扰动也会增长（亚金斯）。这种包含潮汐场的方法开辟了一种研究引力系统不稳定性的新方法。的治疗是一般的和简单的分析形式的修改后的牛仔准则，使它很容易获得。
The well-known Jeans criterion describes the onset of instabilities in an infinite, homogeneous, self-gravitating medium supported by pressure. Most realistic astrophysical systems, however, are not isolated - instead they are under the influence of an external field such as the tidal field due to a neighbour. Here, we do a linear perturbation analysis for a system in an external field and obtain a generalized dispersion relation that depends on the wavenumber, the sound speed and also the magnitude of the tidal field. A typical, disruptive tidal field is shown to make the system more stable against perturbations, and results in a higher effective Jeans wavelength. The minimum mass that can become unstable is then higher (super-Jeans) than the usual Jeans mass. Conversely, in a compressive tidal field, perturbations can grow even when the mass is lower (sub-Jeans). This approach involving the inclusion of tidal field opens up a new way of looking at instabilities in gravitating systems. The treatment is general and the simple analytical form of the modified Jeans criterion obtained makes it easily accessible.
星系合并中的全压缩潮汐
DOI：
10.1088/0004-637x/706/1/67
发表时间：
2009
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Renaud
通讯作者：
Renaud
ATLAS3D 项目 - XVI。
影响因子：
4.8
作者：
Bayet E
通讯作者：
Bayet E