Separating the intrinsic alignment signal and the lensing signal using self-calibration in photo- z surveys with KiDS450 and KV450 Data

Yao, Ji; Pedersen, Eske M.; Ishak, Mustapha; Zhang, Pengjie; Agashe, Anish; Xu, Haojie; Shan, Huanyuan

doi:10.1093/mnras/staa1354

Title: Separating the intrinsic alignment signal and the lensing signal using self-calibration in photo- z surveys with KiDS450 and KV450 Data

Journal Article · Fri May 15 00:00:00 EDT 2020 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/staa1354· OSTI ID:1632214

^[1]; Pedersen, Eske M. ^[2]; Ishak, Mustapha ^[2]; Zhang, Pengjie ^[3]; Agashe, Anish ^[2]; Xu, Haojie ^[4]; Shan, Huanyuan ^[5]

Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China, Department of Physics, The University of Texas at Dallas, Dallas, TX 75080, USA
Department of Physics, The University of Texas at Dallas, Dallas, TX 75080, USA
Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China, Tsung-Dao Lee Institute, Shanghai 200240, People’s Republic of China, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, People’s Republic of China
Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Shanghai Astronomical Observatory (SHAO), Nandan Road 80, Shanghai 200030, People’s Republic of China

ABSTRACT To reach the full potential for the next generation of weak lensing surveys, it is necessary to mitigate the contamination of intrinsic alignments (IAs) of galaxies in the observed cosmic shear signal. The self-calibration (SC) of IAs provides an independent method to measure the IA signal from the survey data and the photometric redshift information. It operates differently from the marginalization method based on the IA modelling. In this work, we present the first application of SC to the KiDS450 data and the KV450 data, to split directly the intrinsic shape–galaxy density (Ig) correlation signal and the gravitational shear–galaxy density (Gg) correlation signal, using the information from photometric redshift (photo-z). We achieved a clear separation of the two signals and performed several validation tests. Our measured signals are found to be in general agreement with the KiDS450 cosmic shear best-fitting cosmology, for both lensing and IA measurements. For KV450, we use partial (high-z) data, and our lensing measurements are also in good agreement with KV450 cosmic shear best fit, while our IA signal suggests a larger IA amplitude for the high-z sample. We discussed the impact of photo-z quality on IA detection and several other potential systematic biases. Finally, we discuss the potential application of the information extracted for both the lensing signal and the IA signal in future surveys.

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Research Organization:: Univ. of Texas at Dallas, Richardson, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019206

OSTI ID:: 1632214

Alternate ID(s):: OSTI ID: 1803622

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 495 Journal Issue: 4; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 8 works

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Title: Separating the intrinsic alignment signal and the lensing signal using self-calibration in photo- z surveys with KiDS450 and KV450 Data

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