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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2203.11045 (astro-ph)
[Submitted on 21 Mar 2022]

Title:First measurement of the correlation between cosmic voids and the Lyman-$α$ forest

Authors:Corentin Ravoux, Eric Armengaud, Julian Bautista, Jean-Marc Le Goff, Nathalie Palanque-Delabrouille, James Rich, Michael Walther, Christophe Yèche
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Abstract:We report the first detection of large-scale matter flows around cosmic voids at a median redshift z = 2.49. Voids are identified within a tomographic map of the large-scale matter density built from eBOSS Lyman-$\alpha$ (Lya) forests in SDSS Stripe 82. We measure the imprint of flows around voids, known as redshift-space distortions (RSD), with a statistical significance of 10 $\sigma$. The observed quadrupole of the void-forest cross-correlation is described by a linear RSD model. The derived RSD parameter is $\beta = 0.52 \pm 0.05$. Our model accounts for the tomographic effect induced by the Lya data being located along parallel quasar lines of sight. This work paves the way towards growth-rate measurements at redshifts currently inaccessible to galaxy surveys.
Comments: 5 pages, 3 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:2203.11045 [astro-ph.CO]
  (or arXiv:2203.11045v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2203.11045

Submission history

From: Eric Armengaud [view email]
[v1] Mon, 21 Mar 2022 15:11:19 UTC (91 KB)
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