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Tang, Chengfeng; Zhang, Pierre; Luo, Wentao3; Li, Nan4; Cai, Yi-Fu; Pi, Shi3,5
Measuring the Gravitomagnetic Distortion from Rotating Halos. I. Methods
Source PublicationASTROPHYSICAL JOURNAL
Language英语
AbstractSource galaxy images are distorted not only by a static gravitational potential, but also by frame-dragging induced by massive rotating objects like clusters of galaxies. Such an effect is well understood theoretically; it is therefore of great interest to estimate its detectability for future surveys. In this work, we analyze the lensing convergence kappa around rotating dark matter halos. The rotation of the massive objects generates a gravitomagnetic potential giving rise to an anisotropic contribution to the lensing potential. We construct an estimator delta kappa to describe the difference between the symmetric enhancement and reduction of kappa around the halo rotation axis, finding that it is well approximated by a function proportional to the halo velocity dispersion squared times a dimensionless angular momentum parameter. Using simulation mocks with realistic noise level for a survey like the Legacy Survey of Space and Time (LSST), we test our estimator, and show that the signal from frame-dragging of stacked rotating lenses is consistent with zero within 1 sigma. However, we find that the most massive cluster in SDSS DR7 spectroscopic selected group catalog has a line-of-sight rotation velocity of 195.0 km s(-1) and velocity dispersion of 667.8 km s(-1), which is at 1.2 x 10(-8) odds according to the angular momentum probability distribution inferred from N-body simulations. By studying SDSS DR7 spectroscopic selected group catalog, we show how rotating clusters can be identified, and, finding that fast rotating clusters might be more abundant than in estimates based on simulations, a detection of gravitomagnetic distortion may be at reach in future surveys.
2021
ISSN0004-637X
Volume911Issue:1Pages:44
Cooperation Status国际
Subject AreaAstronomy & Astrophysics
MOST Discipline CatalogueAstronomy & Astrophysics
DOI10.3847/1538-4357/abe69e
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27394
CollectionSCI期刊论文
Affiliation1.Univ Sci & Technol China, Sch Phys Sci, Dept Astron, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
4.Univ Tokyo, Kavli Inst Phys & Math Universe Kavli IPMU, WPI, Chiba 2778582, Japan
5.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
6.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Tang, Chengfeng,Zhang, Pierre,Luo, Wentao,et al. Measuring the Gravitomagnetic Distortion from Rotating Halos. I. Methods[J]. ASTROPHYSICAL JOURNAL,2021,911(1):44.
APA Tang, Chengfeng,Zhang, Pierre,Luo, Wentao,Li, Nan,Cai, Yi-Fu,&Pi, Shi.(2021).Measuring the Gravitomagnetic Distortion from Rotating Halos. I. Methods.ASTROPHYSICAL JOURNAL,911(1),44.
MLA Tang, Chengfeng,et al."Measuring the Gravitomagnetic Distortion from Rotating Halos. I. Methods".ASTROPHYSICAL JOURNAL 911.1(2021):44.
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