A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2021

A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters

A. Veropalumbo
  • Fonction : Auteur
E. Branchini
B. Granett
L. Guzzo
  • Fonction : Auteur
F. Marulli
M. Moresco
L. Moscardini
  • Fonction : Auteur
A. Pezzotta
  • Fonction : Auteur

Résumé

We measure the galaxy two- and three-point correlation functions at z = [0.5, 0.7] and z = [0.7, 0.9], from the Public Data Release 2 (PDR2) of the VIMOS Public Extragalactic Redshift Survey (VIPERS). We model the two statistics including a non-linear one-loop model for the two-point function and a tree-level model for the three-point function, and perform a joint likelihood analysis. The entire process and non-linear corrections are tested and validated through the use of the 153 highly realistic VIPERS mock catalogues, showing that they are robust down to scales as small as 10 |$h^{-1} \, \mathrm{Mpc}$|⁠. The mocks are also adopted to compute the covariance matrix that we use for the joint two- and three-point analysis. Despite the limited statistics of the two (volume-limited) subsamples analysed, we demonstrate that such a combination successfully breaks the degeneracy existing at two-point level between clustering amplitude σ_8, linear bias b_1, and the linear growth rate of fluctuations f. For the latter, in particular, we measure |$f(z=0.61)=0.64^{+0.55}_{-0.37}$| and f(z = 0.8) = 1.0 ± 1.0, while the amplitude of clustering is found to be σ_8(z = 0.61) = 0.50 ± 0.12 and |$\sigma _8(z=0.8)=0.39^{+0.11}_{-0.13}$|⁠. These values are in excellent agreement with the extrapolation of a Planck cosmology.
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Dates et versions

hal-03282321 , version 1 (29-04-2023)

Identifiants

Citer

A. Veropalumbo, I. Saez Casares, E. Branchini, B. Granett, L. Guzzo, et al.. A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters. Monthly Notices of the Royal Astronomical Society, 2021, 507 (1), pp.1184-1201. ⟨10.1093/mnras/stab2205⟩. ⟨hal-03282321⟩
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