A kinematic confirmation of the hidden Vela supercluster

Abstract

The universe region obscured by the Milky Way is very large and only future blind large HI redshift, and targeted peculiar surveys on the outer borders will determine how much mass is hidden there. Meanwhile, we apply for the first time two independent techniques to the galaxy peculiar velocity catalog $CosmicFlows-3$ in order to explore for the kinematic signature of a specific large-scale structure hidden behind this zone : the Vela supercluster at cz $\sim 18,000$,km s${}^{-1}$ . Using the gravitational velocity and density contrast fields, we find excellent agreement when comparing our results to the Vela object as traced in redshift space. The article provides the first kinematic evidence of a major mass concentration (knot of the Cosmic Web) located in the direction behind Vela constellation, pin-pointing that the Zone of Avoidance should be surveyed in detail in the future .

arXiv comment6 pages, 3 figures, accepted in MNRAS

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Cited by in corpus (13)

• The Hestia project: simulations of the Local Group
• Gravity in the Local Universe : density and velocity fields using CosmicFlows-4
• Cosmicflows-3: The South Pole Wall
• The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm
• COWS: A filament finder for Hessian cosmic web identifiers
• Dynamic cosmography of the local Universe: Laniakea and five more watershed superclusters
• WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields
• Unveiling the largest structures in the nearby Universe: Discovery of the Quipu superstructure
• Segmenting the Universe into dynamically coherent basins
• Galaxy clusters in the Vela supercluster. -- I. Deep NIR catalogues
• The Distance and Peculiar Velocity of the Norma cluster (ACO 3627) using the Near-Infrared $J$ and $K_s$-band Fundamental Plane Relations
• Infall of galaxies onto groups
• The $K_s$-band luminosity function of the rich cluster VC04 in the Vela supercluster