On the sociology and hierarchy of voids: a study of seven CAVITY nearby galaxy voids and their dynamical CosmicFlows-3 environment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2023

On the sociology and hierarchy of voids: a study of seven CAVITY nearby galaxy voids and their dynamical CosmicFlows-3 environment

R. van de Weygaert
  • Fonction : Auteur
J. Domínguez-Gómez
  • Fonction : Auteur
S. Duarte-Puertas
  • Fonction : Auteur
E. Florido
  • Fonction : Auteur
L. Galbany
  • Fonction : Auteur
R. García-Benito
  • Fonction : Auteur
J.M. van der Hulst
  • Fonction : Auteur
K. Kreckel
  • Fonction : Auteur
R.E. Miura I. Pérez
  • Fonction : Auteur
S. Planelles
  • Fonction : Auteur
V. Quilis
  • Fonction : Auteur
J. Román
  • Fonction : Auteur

Résumé

Context. The present study addresses a key question for our understanding of the relation between void galaxies and their environment: the relationship between luminous and dark matter in and around voids. Aims. To explore how empty of matter local Universe voids are, we study the full (dark+luminous) matter content of seven nearby cosmic voids that are fully contained within the CosmicFlows-3 volume. Methods. The cosmic voids matter density profiles are independently obtained using two different methods. They are built on one hand from the galaxy redshift space 2 points-correlation function and, on the other hand, using peculiar velocity gradients from the CosmicFlows-3 dataset. Results. The results are noticeable since when using the redshift survey, all voids show a radial positive gradient of galaxies, while based on the dynamical analysis, only three of these voids display a clear underdensity of matter in their center. Conclusions. It is the first time such a detailed observational analysis of voids is conducted, showing that void emptiness should be derived from dynamical information. Yet, from this limited study, the Hercules void is the best candidate for a local Universe pure "pristine volume" expanding in 3 directions with no dark matter located in that void.

Dates et versions

hal-03898545 , version 1 (14-12-2022)

Identifiants

Citer

H.M. Courtois, R. van de Weygaert, M. Aubert, D. Pomarède, D. Guinet, et al.. On the sociology and hierarchy of voids: a study of seven CAVITY nearby galaxy voids and their dynamical CosmicFlows-3 environment. Astronomy and Astrophysics - A&A, 2023, 673, pp.A38. ⟨10.1051/0004-6361/202245578⟩. ⟨hal-03898545⟩
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