First measurement of the correlation between cosmic voids and the Lyman-α forest
Abstract
We report the first detection at a median redshift z = 2.49 of large-scale matter flows around cosmic voids. Voids are identified within a tomographic map of large-scale Lyman-α (Lyα) transmissions, built from the eBOSS Lyα forest sample in the SDSS Stripe 82 field. We measure the imprint of flows around voids, known as redshift-space distortions (RSD), with a statistical significance of 8\,σ. The observed quadrupole of the void-forest cross-correlation is described by a linear RSD model. The derived RSD parameter of the Lyα forest around voids is β = 1.21 0.18. Our model accounts for the tomographic effect induced by the Lyα data being located along parallel quasar lines of sight. This work presents a novel approach to observing the growth of cosmic structures at redshifts currently inaccessible to galaxy surveys.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.