中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 中国科学院紫金山天文台研究生部  > 学生文章
题名: NIHAO III: the constant disc gas mass conspiracy
作者: Stinson, G. S.1; Dutton, A. A.1; Wang Lei(王蕾)1, 2; Maccio, A. V.1; Herpich, J.1; Bradford, J. D.3; Quinn, T. R.4; Wadsley, J.5; Keller, B.5
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2015-11-21
卷号: 454, 期号:1, 页码:1105-1116
关键词: hydrodynamics ; galaxies: formation ; galaxies: ISM
DOI: 10.1093/mnras/stv1985
文章类型: Article
英文摘要: We show that the cool gas masses of galactic discs reach a steady state that lasts many Gyr after their last major merger in cosmological hydrodynamic simulations. The mass of disc gas, M-gas, depends mostly upon a galaxy virial mass and halo's spin, and less upon stellar feedback. Haloes with low spin have high star formation efficiency and lower disc gas mass. Similarly, lower stellar feedback leads to more star formation so the gas mass ends up being nearly the same regardless of stellar feedback strength. Rather than regulating cool gas mass, stellar feedback regulates the mass of stars that forms. Even considering spin, the M-gas relation with halo mass, M-200 only shows a factor of 3 scatter. The simulated M-gas-M-200 relation shows a break at M-200 = 2 x 10(11) M-circle dot that corresponds to an observed break in the M-gas-M-star relation. The galaxies that maintain constant disc masses share a common halo gas density profile shape in all the simulated galaxies. In their outer regions, the profiles are isothermal. Where the profile rises above n = 10(-3) cm(-3), the gas readily cools and the profile steepens. Inside the disc, rotation supports gas with a flatter density profile. Energy injection from stellar feedback provides pressure support to the halo gas to prevent runaway cooling flows. The constant gas mass makes simpler models for galaxy formation possible, either using a 'bathtub' model for star formation rates or when modelling chemical evolution.
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 ; STAR-FORMING GALAXIES ; SMOOTHED-PARTICLE HYDRODYNAMICS ; FAST ALPHA SURVEY ; ARECIBO SDSS SURVEY ; MOLECULAR GAS ; SCALING RELATIONS ; STELLAR FEEDBACK ; ILLUSTRIS PROJECT ; SPIRAL GALAXIES
收录类别: SCI
项目资助者: European Research Council under the European Union(321035) ; German Research Foundation (DFG)(Sonderforschungsbereich SFB 881) ; NSERC ; NSF(AST-0908499 ; AST-1311956)
语种: 英语
WOS记录号: WOS:000363657000079
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16031
Appears in Collections:中国科学院紫金山天文台研究生部_学生文章

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, Jiangsu, Peoples R China
3.Yale Univ, Dept Astron, New Haven, CT 06520 USA
4.Univ Washington, Dept Astron, Seattle, WA 98195 USA
5.McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Stinson, G. S.]'s Articles
[Dutton, A. A.]'s Articles
[Wang, L.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Stinson, G. S.]‘s Articles
[Dutton, A. A.]‘s Articles
[Wang, L.]‘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 © 2007-2017  中国科学院紫金山天文台 - Feedback
Powered by CSpace