晚型旋涡星系及其盘的颜色星等关系  

The Color-Magnitude Relation of Late-Type Galaxies and their Disks

作　　者：李化南[1] 邵正义[2] 沈世银[2] 肖泉宝[3] 

机构地区：[1]吉林师范大学物理学院,四平136000 [2]中科院上海天文台,上海200030 [3]上海师范大学,上海200234

出　　处：《天文学报》2009年第1期21-28,共8页Acta Astronomica Sinica

摘　　要：从Sloan数字巡天(Sloan Digital Sky Survey)第二批释放的数据(Data Release Two,简称DR2)中,选择了395个在r波段亮于15等的晚型旋涡星系作为样本,研究了这些星系及其盘的颜色星等关系.结果表明晚型旋涡星系及其盘的三个颜色g-r,r-z和g-z均与r波段的绝对星等有紧密的相关关系:越亮的星系(或盘),颜色越红,而且星系的相关性比盘的更强.We choose 395 late-type spiral galaxies brighter than 15m in r-band from Data Release 2 of Sloan Digital Sky Survey and investigate color-magnitude relations of these galaxies and their disks. It is shown that the color g - r, r - z and g - z of these galaxies and their disks have strong correlations with r-band absolute magnitude, i.e., more luminous galaxies（or disks） have redder colors than less luminous galaxies（or disks）. There are stronger correlations in the galaxies than in the disks.

关 键 词：星系 旋涡 盘 星系 基本参数(颜色) 

分 类 号：P157[天文地球—天文学]