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Pré-Publication, Document De Travail Année : 2022

First measurement of the correlation between cosmic voids and the Lyman-$\alpha$ forest

Résumé

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.

Dates et versions

hal-03630078 , version 1 (04-04-2022)

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Corentin Ravoux, Eric Armengaud, Julian Bautista, Jean-Marc Le Goff, Nathalie Palanque-Delabrouille, et al.. First measurement of the correlation between cosmic voids and the Lyman-$\alpha$ forest. 2022. ⟨hal-03630078⟩
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