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) 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 sigma(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(-0.37)(+0.55) and f(z = 0.8) = 1.0 +/- 1.0, while the amplitude of clustering is found to be sigma(8) (z = 0.61) = 0.50 +/- 0.12 and sigma(8)(z = 0.8) = 0.39(-0.13)(+0.11). These values are in excellent agreement with the extrapolation of a Planck cosmology.

A joint 2- and 3-point clustering analysis of the VIPERS PDR2 catalogue at z ∼ 1: breaking the degeneracy of cosmological parameters / A. Veropalumbo, I. Sáez-Casares, E. Branchini, B. Granett, L. Guzzo, F. Marulli, M. Moresco, L. Moscardini, A. Pezzotta, S. de la , Torre. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 507:1(2021), pp. 1184-1201. [10.1093/mnras/stab2205]

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

B. Granett;L. Guzzo;
2021

Abstract

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) 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 sigma(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(-0.37)(+0.55) and f(z = 0.8) = 1.0 +/- 1.0, while the amplitude of clustering is found to be sigma(8) (z = 0.61) = 0.50 +/- 0.12 and sigma(8)(z = 0.8) = 0.39(-0.13)(+0.11). These values are in excellent agreement with the extrapolation of a Planck cosmology.
galaxies: statisticslarge-scale structure of Universecosmology: observations
Settore FIS/05 - Astronomia e Astrofisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/865370
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