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: NIHAO X: reconciling the local galaxy velocity function with cold dark matter via mock H i observations
作者: Maccio, Andrea V.; Udrescu, Silviu M.; Dutton, Aaron A.; Obreja, Aura; Wang, Liang; Stinson, Greg R.; Kang, Xi
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016
卷号: 463, 期号:1, 页码:0
英文摘要: We used 87 high-resolution hydrodynamical cosmological simulations from the NIHAO suite to investigate the relation between the maximum circular velocity (V-max(DM)) of a dark matter halo in a collisionless simulation and the velocity width of the H i gas in the same halo in the hydrodynamical simulation. These two quantities are normally used to compare theoretical and observational velocity functions and have led to a possible discrepancy between observations and predictions based on the cold dark matter (CDM) model. We show that below 100 km s(-1), there is clear bias between H i -based velocities and V-max(DM), that leads to an underestimation of the actual circular velocity of the halo. When this bias is taken into account, the CDM model has no trouble in reproducing the observed velocity function and no lack of low-velocity galaxies is actually present. Our simulations also reproduce the linewidth-stellar mass (Tully-Fisher) relation and H i sizes, indicating that the H i gas in our simulations is as extended as observed. The physical reason for the lower than expected linewidths is that, in contrast to high-mass galaxies, low-mass galaxies no longer have extended thin H i rotating discs, as is commonly assumed.
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17048
Appears in Collections:南极天文中心_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2016208.pdf(1641KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Maccio, Andrea V.]'s Articles
[Udrescu, Silviu M.]'s Articles
[Dutton, Aaron A.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Maccio, Andrea V.]‘s Articles
[Udrescu, Silviu M.]‘s Articles
[Dutton, Aaron A.]‘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
文件名: 2016208.pdf
格式: Adobe PDF
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