文章基本信息

标题：Unstable spiral modes in disk-shaped galaxies: A general fluid dynamical theory with some preliminary results
本地全文：下载
作者：R. F. Pannatoni ; Y. Y. Lau
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1979
卷号：76
期号：1
页码：4-7
DOI：10.1073/pnas.76.1.4
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：A numerical scheme has been devised to calculate discrete spiral modes in a fluid-dynamical model of disk galaxies. The procedure is free from the usual restrictions imposed upon the asymptotic theory. A radiation condition has been formulated as one of the boundary conditions. For a test model galaxy with moderately low surface density, quantitative agreement is found between the asymptotic spiral modes and the corresponding ones obtained from the present scheme. The present scheme should find ready application to the study of open spiral modes.
关键词：density waves ; galactic dynamics ; spiral arms