The Formation of the Exponential Disk in Spiral Galaxies
The Formation of the Exponential Disk in Spiral Galaxies
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DOI：
10.1086/184981
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发表时间：
1987-09
期刊：
影响因子：
--
通讯作者：
D. Lin;J. Pringle
中科院分区：
文献类型：
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作者：
D. Lin;J. Pringle
提出了旋涡星系中星盘指数分布的形成机制。假设落入形成圆盘的气体的行为类似于吸积盘，它在粘性时间尺度t(V)上演化，并在时间尺度t(恒星)上形成恒星。证明了如果t(V)大致等于t(恒星)，则得到的恒星盘具有指数分布，而与盘的自转定律和假定的粘性公式无关。简要评述了粘性时间尺度与恒星形成时间尺度可能相关的原因。参考文献15篇。
A mechanism for the formation of the exponential stellar disk distribution in spiral galaxies is proposed. It is assumed that the gas which falls in to form the disk behaves like an accretion disk which evolves on a viscous time scale t(v) and forms stars on a time scale t(star). It is demonstrated that if t(v) roughly equals t(star) the resulting stellar disk has an exponential distribution independent of the disk rotation law and of the assumed viscosity prescription. Why the viscous and star formation time scales might be related is briefly commented on. 15 references.