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The impact of line-of-sight structures on measuring H-0 with strong lensing time delays
Li, Nan1,2; Becker, Christoph3; Dye, Simon1
2021-06-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume504Issue:2Pages:2224-2234
AbstractMeasurements of the Hubble-Lemaitre constant from early- and local-Universe observations show a significant discrepancy. In an attempt to understand the origin of this mismatch, independent techniques to measure H-0 are required. One such technique, strong lensing time delays, is set to become a leading contender amongst the myriad methods due to forthcoming large strong lens samples. It is therefore critical to understand the systematic effects inherent in this method. In this paper, we quantify the influence of additional structures along the line of sight by adopting realistic light-cones derived from the cosmoDC2 semi-analytical extragalactic catalogue. Using multiple-lens plane ray tracing to create a set of simulated strong lensing systems, we have investigated the impact of line-of-sight structures on time-delay measurements and in turn, on the inferred value of H-0. We have also tested the reliability of existing procedures for correcting for line-of-sight effects. We find that if the integrated contribution of the line-of-sight structures is close to a uniform mass sheet, the bias in H-0 can be adequately corrected by including a constant external convergence kappa(ext) in the lens model. However, for realistic line-of-sight structures comprising many galaxies at different redshifts, this simple correction overestimates the bias by an amount that depends linearly on the median external convergence. We therefore conclude that lens modelling must incorporate multiple-lens planes to account for line-of-sight structures for accurate and precise inference of H-0.
Keywordgravitational lensing: strong cosmological parameters
Funding OrganizationUK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant
DOI10.1093/mnras/stab984
WOS KeywordLARGE-MAGELLANIC-CLOUD ; POWER-LAW MODELS ; HUBBLE CONSTANT ; EXTERNAL CONVERGENCE ; SPECTROSCOPIC SURVEY ; II. ; GALAXIES ; PRECISION ; LENSES ; MASS
Language英语
Funding ProjectUK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants[ST/K00042X/1] ; BEIS capital funding via STFC capital grants[ST/P002293/1] ; BEIS capital funding via STFC capital grants[ST/R002371/1] ; BEIS capital funding via STFC capital grants[ST/S002502/1] ; Durham University ; STFC operations grant[ST/R000832/1]
Funding OrganizationUK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant ; UK Science and Technology Facilities Council (STFC) ; UK Science and Technology Facilities Council (STFC) ; UK's STFC Ernest Rutherford Fellowship scheme ; UK's STFC Ernest Rutherford Fellowship scheme ; BEIS capital funding via STFC capital grants ; BEIS capital funding via STFC capital grants ; Durham University ; Durham University ; STFC operations grant ; STFC operations grant
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000659453800047
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/76796
Collection中国科学院国家天文台
Corresponding AuthorLi, Nan
Affiliation1.Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England
2.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
3.Univ Durham, Inst Computat Cosmol, Dept Phys, South Rd, Durham DH1 3LE, England
Recommended Citation
GB/T 7714
Li, Nan,Becker, Christoph,Dye, Simon. The impact of line-of-sight structures on measuring H-0 with strong lensing time delays[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,504(2):2224-2234.
APA Li, Nan,Becker, Christoph,&Dye, Simon.(2021).The impact of line-of-sight structures on measuring H-0 with strong lensing time delays.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,504(2),2224-2234.
MLA Li, Nan,et al."The impact of line-of-sight structures on measuring H-0 with strong lensing time delays".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 504.2(2021):2224-2234.
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