First measurement of the correlation between cosmic voids and the Lyman-$α$ forest
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866911440442490880 |
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| author | Ravoux, Corentin Armengaud, Eric Bautista, Julian Rich, James Goff, Jean-Marc Le Palanque-Delabrouille, Nathalie Walther, Michael Yèche, Christophe |
| author_facet | Ravoux, Corentin Armengaud, Eric Bautista, Julian Rich, James Goff, Jean-Marc Le Palanque-Delabrouille, Nathalie Walther, Michael Yèche, Christophe |
| contents | 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-$α$ (Ly$α$) transmissions, built from the eBOSS Ly$α$ 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 Ly$α$ forest around voids is $β= 1.21 \pm 0.18$. Our model accounts for the tomographic effect induced by the Ly$α$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2203_11045 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | First measurement of the correlation between cosmic voids and the Lyman-$α$ forest Ravoux, Corentin Armengaud, Eric Bautista, Julian Rich, James Goff, Jean-Marc Le Palanque-Delabrouille, Nathalie Walther, Michael Yèche, Christophe Cosmology and Nongalactic Astrophysics 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-$α$ (Ly$α$) transmissions, built from the eBOSS Ly$α$ 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 Ly$α$ forest around voids is $β= 1.21 \pm 0.18$. Our model accounts for the tomographic effect induced by the Ly$α$ 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. |
| title | First measurement of the correlation between cosmic voids and the Lyman-$α$ forest |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2203.11045 |