Homogeneity of stellar populations in early-type galaxies with different X-ray properties

被引：6
|
作者：
Kodama, T
Matsushita, K
机构：
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] Univ Tokyo, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
[3] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan
来源：
ASTROPHYSICAL JOURNAL | 2000年 / 539卷 / 01期
关键词：
galaxies : elliptical and lenticular; cD; galaxies : evolution; galaxies : formation; galaxies : ISM; galaxies : stellar content;
D O I：
10.1086/309231
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have found that the stellar populations of early-type galaxies are homogeneous with no significant difference in color or Mg-2 index, despite the dichotomy between X-ray-extended early-type galaxies and X-ray-compact ones. Since the X-ray properties reflect the potential gravitational structure and, hence, the process of galaxy formation, the homogeneity of the stellar populations implies that the formation of stars in early-type galaxies predates the epoch when the dichotomy of the potential structure was established.
引用
收藏
页码：149 / 154
页数：6
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