中国科学院国家天文台机构知识库
Advanced  
NAOC Open IR  > 光学天文研究部  > 期刊论文
题名:
The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars
作者: Ablimit, Iminhaji; Zhao Gang(赵刚)
关键词: Galaxy: general ; Galaxy: halo ; Galaxy: kinematics and dynamics ; stars: variables: RR Lyrae
刊名: ASTROPHYSICAL JOURNAL
发表日期: 2017-09-01
DOI: 10.3847/1538-4357/aa83b2
卷: 846, 期:1
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: WAY HALO ; KINEMATICS ; GALAXY ; KPC ; DISTANCES ; PROFILE ; OBJECTS
英文摘要: We present a sample of 1148 ab-type RR Lyrae (RRLab) variables identified from Catalina Surveys Data Release 1, combined with SDSS DR8 and LAMOST DR4 spectral data. We first use a large sample of 860 Galactic halo RRLab stars and derive the circular velocity distributions for the stellar halo. With the precise distances and carefully determined radial velocities (the center-of-mass radial velocities) and by considering the pulsation of the RRLab stars in our sample, we can obtain a reliable and comparable stellar halo circular velocity curve. We follow two different prescriptions for the velocity anisotropy parameter beta in the Jeans equation to study the circular velocity curve and mass profile. Additionally, we test two different solar peculiar motions in our calculation. The best result we obtained with the adopted solar peculiar motion 1 of (U, V, W) = (11.1, 12, 7.2) km s(-1) is that the enclosed mass of the Milky Way within 50 kpc is (3.75 +/- 1.33). x. 10(11) M-circle dot based on beta = 0 and the circular velocity 180 +/- 31.92 (km s(-1)) at 50 kpc. This result is consistent with dynamical model results, and it is also comparable to the results of previous similar works.
语种: 英语
项目资助者: China Postdoctoral Science Foundation(2015LH0015) ; Natural Science Foundation of China(11390371 ; National Development and Reform Commission ; 11233004)
WOS记录号: WOS:000408362800010
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/20145
Appears in Collections:光学天文研究部_期刊论文

Files in This Item:

There are no files associated with this item.


作者单位: Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China

Recommended Citation:
Ablimit, Iminhaji,Zhao, Gang. The Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars[J]. ASTROPHYSICAL JOURNAL,2017,846(1).
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Ablimit, Iminhaji]'s Articles
[Zhao, Gang]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Ablimit, Iminhaji]‘s Articles
[Zhao, Gang]‘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  中国科学院国家天文台 - Feedback
Powered by CSpace