中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 暗物质和空间天文实验室  > 期刊论文
题名: Measuring patchy reionization with kSZ(2)-21 cm correlations
作者: Ma, Q.; Helgason, K.; Komatsu, E.; Ciardi, B.; Ferrara, A.
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2018
卷号: 476, 期号:3, 页码:4025-4031
英文摘要: We study cross-correlations of the kinetic Sunyaev-Zel'dovich effect (kSZ) and 21 cm signals during the epoch of reionization (EoR) to measure the effects of patchy reionisation. Since the kSZ effect is proportional to the line-of-sight velocity, the kSZ-21 cm cross correlation suffers from cancellation at small angular scales. We thus focus on the correlation between the kSZ-squared field (kSZ(2)) and 21 cm signals. When the global ionization fraction is low (x(e) less than or similar to 0.7), the kSZ(2) fluctuation is dominated by rare ionized bubbles, which leads to an anticorrelation with the 21 cm signal. When 0.8 less than or similar to x(e) < 1, the correlation is dominated by small pockets of neutral regions, leading to a positive correlation. However, at very high redshifts when x(e) < 0.15, the spin temperature fluctuations change the sign of the correlation from negative to positive, as weakly ionized regions can have strong 21 cm signals in this case. To extract this correlation, we find that Wiener filtering is effective in removing large signals from the primary cosmic microwave background (CMB) anisotropy. The expected signal-to-noise ratios for a similar to 10-h integration of upcoming Square Kilometre Array data cross-correlated with maps from the current generation of CMB observatories with 3.4 mu K arcmin noise and 1.7 arcmin beam over 100 deg(2) are 51, 60, and 37 for x(e) = 0.2, 0.5, and 0.9, respectively.
语种: 英语
WOS记录号: WOS:000430944100078
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17996
Appears in Collections:暗物质和空间天文实验室_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
2018087.pdf(1274KB)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
[Ma, Q.]'s Articles
[Helgason, K.]'s Articles
[Komatsu, E.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Ma, Q.]‘s Articles
[Helgason, K.]‘s Articles
[Komatsu, E.]‘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: 2018087.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