The VIMOS Public Extragalactic Redshift Survey (VIPERS)

The matter density and baryon fraction from the galaxy power spectrum at redshift 0.6 < z < 1.1^⋆

¹ INAF–Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via Bassini 15, 20133 Milano, Italy
e-mail: stefano@lambrate.inaf.it
² INAF–Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano – via E. Bianchi 46, 23807 Merate, Italy
³ Università degli Studi di Milano, via G. Celoria 16, 20133 Milano, Italy
⁴ Aix-Marseille Univ., Univ. Toulon, CNRS, CPT, Marseille, France
⁵ Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
⁶ Dipartimento di Fisica, Università di Milano-Bicocca, P.zza della Scienza 3, 20126 Milano, Italy
⁷ Aix-Marseille Univ., CNRS, LAM, Laboratoire d’Astrophysique de Marseille, Marseille, France
⁸ INAF–Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy
⁹ INAF–Osservatorio Astrofisico di Torino, 10025 Pino Torinese, Italy
¹⁰ Laboratoire Lagrange, UMR 7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, 06300 Nice, France
¹¹ Dipartimento di Fisica e Astronomia – Alma Mater Studiorum Università di Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
¹² Institute of Physics, Jan Kochanowski University, ul. Swietokrzyska 15, 25-406 Kielce, Poland
¹³ National Centre for Nuclear Research, ul. Hoza 69, 00-681 Warszawa, Poland
¹⁴ INFN, Sezione di Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
¹⁵ School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK
¹⁶ Aix-Marseille Université, Jardin du Pharo, 58 bd Charles Livon, 13284 Marseille Cedex 7, France
¹⁷ IRAP, 9 Av. du colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
¹⁸ Astronomical Observatory of the Jagiellonian University, Orla 171, 30-001 Cracow, Poland
¹⁹ INAF–Istituto di Astrofisica Spaziale e Fisica Cosmica Bologna, via Gobetti 101, 40129 Bologna, Italy
²⁰ INAF–Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
²¹ Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
²² INFN, Sezione diRoma Tre, via della Vasca Navale 84, 00146 Roma, Italy
²³ INAF–Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone (RM), Italy
²⁴ Department of Astronomy, University of Geneva, Ch. d’Ecogia 16, 1290 Versoix, Switzerland
²⁵ INAF–Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34143 Trieste, Italy
²⁶ Department of Astronomy & Physics, Saint Mary’s University, 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada

Received: 22 November 2016
Accepted: 14 February 2017

Abstract

We use the final catalogue of the VIMOS Public Extragalactic Redshift Survey (VIPERS) to measure the power spectrum of the galaxy distribution at high redshift, presenting results that extend beyond z = 1 for the first time. We apply a fast Fourier transform technique to four independent subvolumes comprising a total of 51 728 galaxies at 0.6 < z < 1.1 (out of the nearly 90 000 included in the whole survey). We concentrate here on the shape of the direction-averaged power spectrum in redshift space, explaining the level of modelling of redshift-space anisotropies and the anisotropic survey window function that are needed to deduce this in a robust fashion. We then use covariance matrices derived from a large ensemble of mock datasets in order to fit the spectral data. The results are well matched by a standard ΛCDM model, with density parameter Ω_M h = 0.227^+0.063_-0.050 and baryon fraction f_B=Ω_B/Ω_M=0.220^+0.058_-0.072. These inferences from the high-z galaxy distribution are consistent with results from local galaxy surveys, and also with the cosmic microwave background. Thus the ΛCDM model gives a good match to cosmic structure at all redshifts currently accessible to observational study.