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Intrinsic Alignment as an RSD Contaminant in the DESI Survey

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arxiv 2209.03949 v3 pith:NZ7YMZ5J submitted 2022-09-08 astro-ph.CO

Intrinsic Alignment as an RSD Contaminant in the DESI Survey

Claire Lamman , Daniel Eisenstein , Jessica Nicole Aguilar , David Brooks , Axel de la Macorra , Peter Doel , Andreu Font-Ribera , Satya Gontcho A Gontcho
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Klaus Honscheid Robert Kehoe Theodore Kisner Anthony Kremin Martin Landriau Michael Levi Ramon Miquel John Moustakas Nathalie Palanque-Delabrouille Claire Poppett Michael Schubnell Gregory Tarl\'e
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keywords alignmentdesisurveytidalintrinsiclrgsmeasurequadrupole
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We measure the tidal alignment of the major axes of Luminous Red Galaxies (LRGs) from the Legacy Imaging Survey and use it to infer the artificial redshift-space distortion signature that will arise from an orientation-dependent, surface-brightness selection in the Dark Energy Spectroscopic Instrument (DESI) survey. Using photometric redshifts to down-weight the shape-density correlations due to weak lensing, we measure the intrinsic tidal alignment of LRGs. Separately, we estimate the net polarization of LRG orientations from DESI's fiber-magnitude target selection to be of order 10^-2 along the line of sight. Using these measurements and a linear tidal model, we forecast a 0.5% fractional decrease on the quadrupole of the 2-point correlation function for projected separations of 40-80 Mpc/h. We also use a halo catalog from the Abacus Summit cosmological simulation suite to reproduce this false quadrupole.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Where Galaxies Point: First Measurement of the Large-Scale Axial Intrinsic Alignment

    astro-ph.CO 2025-11 reject novelty 7.0

    DES galaxy position angles show a coherent preferred axis (RA≈300°, Dec≈50°) — elliptical major and spiral minor axes aligned along it — reported as the first detection of horizon-scale axial intrinsic alignment.

  2. Anisotropic Secondary Bias of Dark Matter Haloes in a $\Lambda$CDM Universe

    astro-ph.CO 2026-07 conditional novelty 6.0

    Halo spin and elongation create a direction-dependent clustering signal that is governed by alignment with the surrounding cosmic web, whereas orientation-averaged secondary bias is governed by tidal anisotropy.

  3. MUltiplexed Survey Telescope (MUST) Science White Paper I: Overview of Large-Scale Structure Cosmology in the Era of Stage-V Spectroscopic Surveys

    astro-ph.CO 2024-11 unverdicted novelty 4.0

    MUST is a planned 6.5m Stage-V spectroscopic survey telescope targeting 100M+ galaxies and quasars to z~5.5 for large-scale structure cosmology studies.