旋涡星系随Hubble序列的一些统计性质

SOME STATISTICAL PROPERTIES OF SPIRAL GALAXIES ALONG HUBBLE SEQUENCES

对发表在A&ApSupplementSeries上的 365个旋涡星系的一些参数 (如表示旋臂缠卷松紧程度的参数Λ、切向角 μ、盘的扁度H/D2 5以及厚度等 )随Hubble序列变化的关系进行了统计研究 .首次得到这些参量的平均值 ;并且从统计结果可以明显地看到Hubble对旋涡星系的分类只是一种定性的、只有统计意义上的分类 ;另外 ,从我们的统计结果看 ,密度波理论的色散关系对大多数旋涡星系是成立的 。

This paper presents some statistical results about the parameters, such as the winding parameter, pitch angle, flatness and thickness of disk along the Hubble sequences for 365 spiral galaxies that have been published in A Ap Supplement Series, and also the mean values of these parameters. The results of analysis show that the Hubble classification of spiral galaxies is only a qualitative method and the dispersion relation is suited to most spiral galaxies.