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- W3100986592 abstract "Studies of cosmological objects should take into account their positions within the cosmic web of large-scale structure. Unfortunately, the cosmic web has only been extensively mapped at low redshifts (), using galaxy redshifts as tracers of the underlying density field. At , the required galaxy densities are inaccessible for the foreseeable future, but 3D reconstructions of Lyα forest absorption in closely separated background QSOs and star-forming galaxies already offer a detailed window into –3 large-scale structure. We quantify the utility of such maps for studying the cosmic web by using realistic z = 2.5 Lyα forest simulations matched to observational properties of upcoming surveys. A deformation tensor-based analysis is used to classify voids, sheets, filaments, and nodes in the flux, which are compared to those determined from the underlying dark matter (DM) field. We find an extremely good correspondence, with 70% of the volume in the flux maps correctly classified relative to the DM web, and 99% classified to within one eigenvalue. This compares favorably to the performance of galaxy-based classifiers with even the highest galaxy densities from low-redshift surveys. We find that narrow survey geometries can degrade the recovery of the cosmic web unless the survey is or deg on the sky. We also examine halo abundances as a function of the cosmic web, and find a clear dependence as a function of flux overdensity, but little explicit dependence on the cosmic web. These methods will provide a new window on cosmological environments of galaxies at this very special time in galaxy formation, high noon, and on overall properties of cosmological structures at this epoch." @default.
- W3100986592 created "2020-11-23" @default.
- W3100986592 creator A5015903834 @default.
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- W3100986592 date "2016-11-07" @default.
- W3100986592 modified "2023-10-18" @default.
- W3100986592 title "REVEALING THE<i>z</i>∼ 2.5 COSMIC WEB WITH 3D Ly<i>α</i>FOREST TOMOGRAPHY: A DEFORMATION TENSOR APPROACH" @default.
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- W3100986592 doi "https://doi.org/10.3847/0004-637x/831/2/181" @default.
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