Lyman-alpha forest tomography and cross-correlation with cosmic voids - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Lyman-alpha forest tomography and cross-correlation with cosmic voids

Résumé

The Lyman-alpha forest is a unique probe of large-scale matter density fluctuations at high redshift (z > 2). It is possible to obtain 3D maps of the matter distribution from Lyman-alpha data, using tomographic reconstruction methods. Here, we present the largest tomographic map of matter fluctuations at z > 2, over the Gpc^3 volume covered by Lyman-alpha forest from SDSS-IV quasar spectra in the Stripe 82 field. We present a catalog of high-redshift voids constructed from this map. The measurement of the cross-correlation between these voids and the Lyman-alpha forest provides the first observation of the matter velocity flow around voids, through the RSD effect, at such high redshift. The data is in good agreement with simulations and is well adjusted with a linear, Kaiser velocity model.

Dates et versions

hal-03621485 , version 1 (28-03-2022)

Identifiants

Citer

Corentin Ravoux. Lyman-alpha forest tomography and cross-correlation with cosmic voids. 56th Rencontres de Moriond on Cosmology, Jan 2022, La Thuile, Italy. ⟨hal-03621485⟩
17 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More