An estimation of the local growth rate from Cosmicflows peculiar velocities. Issue 1 (27th March 2019)

• Record Type: Journal Article
• Authors: Dupuy, Alexandra; Courtois, Helene M; Kubik, Bogna
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 486:Issue 1(2019)
• Page Start: 440
• Page End: 448
• Publication Date: 2019-03-27
• Subjects: cosmological parameters -- large-scale structure of Universe -- cosmology: observations; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz901
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: This article explores three usual estimators, noted as v 12 of the pairwise velocity, ψ1 and ψ2 of the observed two-point galaxy peculiar velocity correlation functions. These estimators are tested on mock samples of Cosmicflows-3 data set (Tully, Courtois & Sorce), derived from a numerical cosmological simulation, and also on a number of constrained realizations of this data set. Observational measurements errors and cosmic variance are taken into consideration in the study. The result is a local measurement of f σ8 = 0.43(± 0.03)obs (± 0.11)cosmic out to z = 0.05, in support of a ΛCDM cosmology.