Continuum Models for Gas in Disturbed Galaxies. III. Bifurcations and Chaos in a Deterministic Model for Bursts of Star Formation
Continuum Models for Gas in Disturbed Galaxies. III. Bifurcations and Chaos in a Deterministic Model for Bursts of Star Formation
复制标题
扰动星系中气体的连续体模型。
DOI：
10.1086/191191
复制
发表时间：
1987
影响因子：
8.7
通讯作者：
J. Scalo
中科院分区：
文献类型：
--
作者：
C. Struck;J. Scalo
对描述星际云演化和恒星形成的奥尔特模型方程的非线性行为进行了研究。给出了Oort模型的单区云流体方程，并展示了随着时滞参数T(d)的增加，系统如何分岔到伴随恒星形成爆发的极限环行为，随着T(d)的进一步增加，系统遭受进一步的分岔导致混沌行为。采用线性稳定性分析，包括时滞，证明了奥尔特模型的行为不敏感地依赖于所涉及的其他参数。并证明了极限环分岔的起始点可以解析预测。计算的主要预测与星系中恒星形成活动的现有相关观测进行了比较，特别是潮汐相互作用的星系。112年引用。
A study of the nonlinear behavior of model equations describing the Oort model for interstellar cloud evolution and star formation is presented. One-zone cloud fluid equations for the Oort model are given, and it is shown how, as the time-delay parameter T(d) is increased, the system bifurcates to limit-cycle behavior accompanied by star formation bursts and, with further increase in T(d), suffers further bifurcations leading to chaotic behavior. A linear stability analysis, including time delay, is used to demonstrate that the behavior of the Oort model does not depend sensitively on the other parameters involved. It is also shown that the onset of bifurcation to a limit cycle can be predicted analytically. The major predictions of the calculations are compared with available relevant observations of star formation activity in galaxies, especially tidally interacting galaxies. 112 references.