First Detection of the GI-Type of Intrinsic Alignments of Galaxies Using the Selfcalibration Method in a Photometric Galaxy Survey

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dc.contributor.ORCID0000-0002-6024-466X (Ishak-Boushaki, M)
dc.contributor.ORCID0000-0002-7336-2796 (Yao, J)
dc.contributor.authorPedersen, Eske M.
dc.contributor.authorYao, Ji
dc.contributor.authorIshak-Boushaki, Mustapha
dc.contributor.utdAuthorPedersen, Eske M.
dc.contributor.utdAuthorYao, Ji
dc.contributor.utdAuthorIshak-Boushaki, Mustapha
dc.date.accessioned2020-10-15T15:58:15Z
dc.date.available2020-10-15T15:58:15Z
dc.date.issued2020-08-05
dc.descriptionDue to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article).
dc.description.abstractWeak 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.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.identifier.bibliographicCitationPederson, E. M., Ji Yao, Mustapha Ishak-Boushaki. 2019. "First Detection of the GI-Type of Intrinsic Alignments of Galaxies Using the Selfcalibration Method in a Photometric Galaxy Survey." The Astrophysical Journal Letters 899: art. L5, doi: 10.3847/2041-8213/aba51b
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/aba51b
dc.identifier.urihttps://hdl.handle.net/10735.1/9020
dc.identifier.volume899
dc.language.isoen
dc.publisherInstitute of Physics
dc.rights©2020 The American Astronomical Society. All rights reserved.
dc.source.journalThe Astrophysical Journal Letters
dc.subjectAstronomy—Observations
dc.subjectGravitational lenses
dc.subjectDark matter (Astronomy)
dc.subjectGalaxies
dc.titleFirst Detection of the GI-Type of Intrinsic Alignments of Galaxies Using the Selfcalibration Method in a Photometric Galaxy Survey
dc.type.genrearticle

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