盘状星系的大小分布的统计研究  

The Statistical Study on the Size Distribution of Disk Galaxies

作　　者：吴海滨[1] 张波[2] 常瑞香[3] 张明轩[1] 

机构地区：[1]石家庄学院物理系,石家庄050035 [2]河北师范大学物理系,石家庄050016 [3]中国科学院上海天文台,上海200030

出　　处：《天文研究与技术》2008年第1期1-6,共6页Astronomical Research & Technology

基　　金：国家自然科学基金(10673002)资助

摘　　要：在Sloan数字巡天计划第四批释放的数据中选择了40599个面向的盘状星系,统计研究它们的大小分布。结果表明,面向盘状星系的大小分布在绝对星等区间内,遵从对数正态分布函数。星系的大小与绝对星等紧密相关,即星系越亮,其尺度越大。与文[1]的结果相比,在相同的绝对星等区间,我们得到的r波段半光度半径要稍高于他们的结果,这主要是因为我们的样本只包括了面向晚型星系,而他们的样本则包括了所有空间取向的晚型星系。We chose 40599 face-on disk galaxies from Data Release 4 of Sloan Digital Sky Survey and statistically investigated their sizes. It is shown that the sizes distribution of disk galaxies at the given abosolute magnitude is well described by a log-normal function for late-type galaxies. There is a tight relation between the size of galaxies and the abesolute magnitude, that is, the bigger the brighter. We also compared our results with shen et al. （2003） in the same abosolute magnitude bin, Our results show that the half-light radii in r band is little higher than theirs. Because our samples are only for face-on late-type galaxies while theirs included all late-type galaxies.

关 键 词：星系:基本参数(分类 光度 半径) 星系:形成 星系:演化 

分 类 号：P145.8[天文地球—天体物理] TS75[天文地球—天文学]