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

Abstract

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.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1];  [3]
  1. Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics
  2. Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics; Shanghai Jiao-Tong Univ. (China). Dept. of Astronomy
  3. Shanghai Jiao-Tong Univ. (China). Dept. of Astronomy
Publication Date:
Research Org.:
Univ. of Texas at Dallas, Richardson, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1803625
Grant/Contract Number:  
SC0019206; AST-1517768
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal. Letters (Online); Journal Volume: 899; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & astrophysics; Observational cosmology; Weak gravitational lensing

Citation Formats

Pedersen, Eske M., Yao, Ji, Ishak, Mustapha, and Zhang, Pengjie. First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey. United States: N. p., 2020. Web. doi:10.3847/2041-8213/aba51b.
Pedersen, Eske M., Yao, Ji, Ishak, Mustapha, & Zhang, Pengjie. First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey. United States. https://doi.org/10.3847/2041-8213/aba51b
Pedersen, Eske M., Yao, Ji, Ishak, Mustapha, and Zhang, Pengjie. Wed . "First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey". United States. https://doi.org/10.3847/2041-8213/aba51b. https://www.osti.gov/servlets/purl/1803625.
@article{osti_1803625,
title = {First Detection of the GI-type of Intrinsic Alignments of Galaxies Using the Self-calibration Method in a Photometric Galaxy Survey},
author = {Pedersen, Eske M. and Yao, Ji and Ishak, Mustapha and Zhang, Pengjie},
abstractNote = {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.},
doi = {10.3847/2041-8213/aba51b},
journal = {The Astrophysical Journal. Letters (Online)},
number = 1,
volume = 899,
place = {United States},
year = {Wed Aug 05 00:00:00 EDT 2020},
month = {Wed Aug 05 00:00:00 EDT 2020}
}

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