First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey

Pedersen, Eske M.; Yao, Ji; Ishak, Mustapha; Zhang, Pengjie

doi:10.3847/2041-8213/aba51b

Title: First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey

Journal Article · Wed Aug 05 00:00:00 EDT 2020 · The Astrophysical Journal. Letters (Online)

DOI:https://doi.org/10.3847/2041-8213/aba51b· OSTI ID:1803625

Pedersen, Eske M. ^[1];

^[2];

^[1]; Zhang, Pengjie ^[3]

Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics
Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics; Shanghai Jiao-Tong Univ. (China). Dept. of Astronomy
Shanghai Jiao-Tong Univ. (China). Dept. of Astronomy

Weak gravitational lensing is one of the most promising cosmological probes to constrain dark matter, dark energy, and the nature of gravity at cosmic scales. Intrinsic alignments (IAs) of galaxies have been recognized as one of the most serious systematic effects facing gravitational lensing. Such alignments must be isolated and removed to obtain a pure lensing signal. Furthermore, the alignments are related to the processes of galaxy formation, so their extracted signal can help in understanding such formation processes and improving their theoretical modeling. We report in this Letter the first detection of the gravitational shear–intrinsic shape (GI) correlation and the intrinsic shape–galaxy density (Ig) correlation using the self-calibration method in a photometric redshift survey. These direct measurements are made from the KiDS-450 photometric galaxy survey with a significance of 3.65σ in the third bin for the Ig correlation, and 3.51σ for the GI cross-correlation between the third and fourth bins. The self-calibration method uses the information available from photometric surveys without needing to specify an IA model and will play an important role in validating IA models and IA mitigation in future surveys such as the Rubin Observatory Legacy Survey of Space and Time, Euclid, and WFIRST.

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

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0019206; AST-1517768

OSTI ID:: 1803625

Journal Information:: The Astrophysical Journal. Letters (Online), Vol. 899, Issue 1; ISSN 2041-8213

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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