A proposal on the galaxy intrinsic alignment self-calibration in weak lensing surveys

Abstract

The galaxy intrinsic alignment causes the galaxy ellipticity-ellipticity power spectrum between two photometric redshifts to decrease faster with respect to the redshift separation $\Delta z^P$, for fixed mean redshift. This offers a valuable diagnosis on the intrinsic alignment. We show that the distinctive dependences of the GG, II and GI correlations on $\Delta z^P$ over the range $|Δz^P|\la 0.2$ can be understood robustly without strong assumptions on the intrinsic alignment. This allows us to measure the intrinsic alignment within each conventional photo-z bin of typical size $\ga 0.2$, through lensing tomography of photo-z bin size $\sim 0.01$. Both the statistical and systematical errors in the lensing cosmology can be reduced by this self-calibration technique.

v2: minor revisions. 5 pages, 4 figures. MNRAS letters in press

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Cited by in corpus (17)

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• Multitracing Anisotropic Non-Gaussianity with Galaxy Shapes
• The MillenniumTNG Project: Intrinsic alignments of galaxies and halos
• Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations
• Contamination of early-type galaxy alignments to galaxy lensing-CMB lensing cross-correlation
• The Subaru FMOS galaxy redshift survey (FastSound). V. Intrinsic alignments of emission line galaxies at $z\sim 1.4$
• KiDS-1000: cross-correlation with Planck cosmic microwave background lensing and intrinsic alignment removal with self-calibration
• Separating the Intrinsic Alignment Signal and the Lensing Signal using Self-Calibration in Photo-z Surveys with KiDS450 and KV450 Data
• Self-calibration method for II and GI types of intrinsic alignments of galaxies
• The source-lens clustering effect in the context of lensing tomography and its self-calibration
• Statistical separation of weak gravitational lensing and intrinsic ellipticities based on galaxy colour information
• A rising tide: Intrinsic alignments since the turn of the millennium
• Intrinsic correlations of galaxy sizes in a hydrodynamical cosmological simulation
• Intrinsic alignments of galaxies in multiple projections