PMO OpenIR
Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations
Wei, Chengliang1,2; Li, Guoliang1; Kang, Xi1; Luo, Yu1; Xia, Qianli1,2; Wang, Peng1,2; Yang, Xiaohu3; Wang, Huiyuan4; Jing, Yipeng3; Mo, Houjun5; Lin, Weipeng6; Wang, Yang6; Li, Shijie7; Lu, Yi7; Zhang, Youcai7; Lim, S. H.5; Tweed, Dylan3; Cui, Weiguang8
2018-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume853Issue:1Pages:18
Corresponding AuthorLi, Guoliang(Guoliang@pmo.ac.cn)
AbstractThe intrinsic alignment of galaxies is an important systematic effect in weak-lensing surveys, which can affect the derived cosmological parameters. One direct way to distinguish different alignment models and quantify their effects on the measurement is to produce mock weak-lensing surveys. In this work, we use the full-sky ray-tracing technique to produce mock images of galaxies from the ELUCID N-body simulation run with WMAP9 cosmology. In our model, we assume that the shape of the central elliptical galaxy follows that of the dark matter halo, and that of the spiral galaxy follows the halo spin. Using the mock galaxy images, a combination of galaxy intrinsic shape and the gravitational shear, we compare the predicted tomographic shear correlations to the results of the Kilo-Degree Survey (KiDS) and Deep Lens Survey (DLS). We find that our predictions stay between the KiDS and DLS results. We rule out a model in which the satellite galaxies are radially aligned with the center galaxy; otherwise, the shear correlations on small scales are too high. Most importantly, we find that although the intrinsic alignment of spiral galaxies is very weak, they induce a positive correlation between the gravitational shear signal and the intrinsic galaxy orientation (GI). This is because the spiral galaxy is tangentially aligned with the nearby large-scale overdensity, contrary to the radial alignment of the elliptical galaxy. Our results explain the origin of the detected positive GI term in the weak-lensing surveys. We conclude that in future analyses, the GI model must include the dependence on galaxy types in more detail.
Keywordgravitational lensing: weak large-scale structure of universe methods: numerical
DOI10.3847/1538-4357/aaa40d
WOS KeywordLARGE-SCALE STRUCTURE ; DARK-MATTER HALOS ; COSMOLOGICAL HYDRODYNAMICAL SIMULATION ; HORIZON-AGN ; MILLENNIUM SIMULATION ; SATELLITE GALAXIES ; RADIAL ALIGNMENT ; CLUSTER GALAXIES ; ANGULAR-MOMENTUM ; MASSIVEBLACK-II
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000422954000001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22182
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Guoliang
Affiliation1.Purple Mt Observ, Partner Grp MPI Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Grad Sch, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Shanghai Jiao Tong Univ, Dept Astron, Shanghai 200240, Peoples R China
4.Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
5.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
6.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Guangdong, Peoples R China
7.Shanghai Astron Observ, Nandan Rd 80, Shanghai 200030, Peoples R China
8.Univ Autonoma Madrid, Fac Ciencias, Dept Fis Teor, Modulo 15, E-28049 Madrid, Spain
Recommended Citation
GB/T 7714
Wei, Chengliang,Li, Guoliang,Kang, Xi,et al. Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations[J]. ASTROPHYSICAL JOURNAL,2018,853(1):18.
APA Wei, Chengliang.,Li, Guoliang.,Kang, Xi.,Luo, Yu.,Xia, Qianli.,...&Cui, Weiguang.(2018).Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations.ASTROPHYSICAL JOURNAL,853(1),18.
MLA Wei, Chengliang,et al."Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations".ASTROPHYSICAL JOURNAL 853.1(2018):18.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wei, Chengliang]'s Articles
[Li, Guoliang]'s Articles
[Kang, Xi]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wei, Chengliang]'s Articles
[Li, Guoliang]'s Articles
[Kang, Xi]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wei, Chengliang]'s Articles
[Li, Guoliang]'s Articles
[Kang, Xi]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

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