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

S. Rota, B. R. Granett, J. Bel, Luigi Guzzo, John A. Peacock, M. J. Wilson, A. Pezzotta, Sylvain de la Torre, Bianca Garilli, M. Bolzonella, M. Scodeggio, Ummi Abbas, C. Adami, D. Bottini, A. Cappi, O. Cucciati, I. Davidson, Paolo Franzetti, A. Fritz, A. IovinoJ. Krywult, V. Le Brun, O. Le Fèvre, D. Mascagni, K. Małek, Federico Marulli, W. J. Percival, M. Polletta, A. Pollo, L. A. M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, S. Arnouts, Enzo Branchini, J. Coupon, Gabriella De Lucia, O. Ilbert, Lauro Moscardini, T. Moutard

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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 ΩM h = 0.227+0.063-0.050 and baryon fraction fBBM=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.
Original languageEnglish
Article numberA144
Number of pages15
JournalAstronomy and Astrophysics
Volume601
Early online date23 May 2017
DOIs
Publication statusPublished - May 2017

Keywords

  • astro-ph.CO
  • cosmological parameters
  • large-scale structure of Universe
  • galaxies: high-redshift
  • galaxies: statistics

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