A formation scenario of dwarf spheroidal galaxies

被引：2
|
作者：
Kamaya, Hideyuki [1 ]
机构：
[1] Natl Def Acad, Sch Appl Sci, Dept Earth & Ocean Sci, Yokosuka, Kanagawa 2398686, Japan
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2008年 / 317卷 / 3-4期
关键词：
Galaxy: halo; Galaxies: dwarf; Galaxies: Local Group;
D O I：
10.1007/s10509-008-9884-6
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this paper, the author proposes a formation scenario of dwarf spheroidal galaxies (dSphs); part of dSphs form as a result of collision of dark matter (DM) halos which retain ISM (interstellar medium). First of all, a primordial dSph forms compact when collision of DM halos occurs. After the collision, the primordial dSph leaves a mass-radius relation among old stellar systems. This intermediate evolutionary phase finishes when the galactic wind occurs. Finally, it is re-virialized. Once this scenario is adopted, we explain the reason why large M/L (mass-to-light ratio) is a result of galactic wind. Then, we conclude it is possible for part of dSphs to be remnants of DM halo collisions.
引用
收藏
页码：235 / 238
页数：4
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