中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 南极天文中心  > 期刊论文
题名: WHAT SETS THE SIZES OF THE FAINTEST GALAXIES?
作者: Brasseur, Crystal M.1; Martin, Nicolas F.1; Maccio, Andrea V.1; Rix, Hans-Walter1; Kang Xi(康熙)2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2011-12-20
卷号: 743, 期号:2
关键词: galaxies: dwarf ; galaxies: structure ; Local Group
DOI: 10.1088/0004-637X/743/2/179
文章类型: Article
英文摘要: We provide a comprehensive description and offer an explanation for the sizes of the faintest known galaxies in the universe, the dwarf spheroidal (dSph) satellites of the Milky Way and Andromeda. After compiling a consistent data set of half-light radii (r(1/2)) and luminosities, we describe the size-luminosity relation of dSphs by a log-normal distribution in r(1/2) with a mean size that varies as a function of luminosity. Accounting for modest number statistics, measurement uncertainties, and surface brightness limitations, we find that the size-luminosity relations of the Milky Way and Andromeda dSph populations are statistically indistinguishable and also very similar: their mean sizes at a given stellar luminosity differ by no more than 30%. In addition, we find that the mean size, slope, and scatter of this log-normal size description of Local Group dSphs match onto the relation of more massive low-concentration galaxies. This suggests that the stellar sizes of dSphs are ultimately related to their overall initial baryonic angular momentum. To test this hypothesis, we perform a series of high-resolution N-body simulations that we couple with a semi-analytic model of galaxy formation. These predict the same mean size and slope as observed in dSph satellites. At the same time, these models predict that the size-luminosity distributions for satellite galaxies around similar host halos must be similar providing a natural explanation as to why the size distributions of Milky Way and Andromeda satellites are similar. Although strong rotation is currently not observed in dSphs, this may well be consistent with our angular-momentum-based explanation for their sizes if the disks of these galaxies have become sufficiently stirred through tidal interaction.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DARK-MATTER HALOES ; MILKY-WAY SATELLITES ; KECK/DEIMOS SPECTROSCOPIC SURVEY ; DWARF SPHEROIDAL GALAXIES ; LOCAL GROUP ; ELLIPTIC GALAXIES ; STRUCTURAL-PROPERTIES ; SEMIANALYTICAL MODEL ; LUMINOSITY FUNCTION ; DISK GALAXIES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000298178400081
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15982
Appears in Collections:南极天文中心_期刊论文

Files in This Item:

There are no files associated with this item.


作者单位: 1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Purple Mt Observ, Nanjing 210008, Peoples R China
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Brasseur, Crystal M.]'s Articles
[Martin, Nicolas F.]'s Articles
[Maccio, Andrea V.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Brasseur, Crystal M.]‘s Articles
[Martin, Nicolas F.]‘s Articles
[Maccio, Andrea V.]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院紫金山天文台 - Feedback
Powered by CSpace