The VIMOS Public Extragalactic Redshift Survey (VIPERS): reconstruction of the redshift-space galaxy density field

B. R. Granett, E. Branchini, L. Guzzo, U. Abbas, C. Adami, S. Arnouts, J. Bel, M. Bolzonella, D. Bottini, A. Cappi, J. Coupon, O. Cucciati, I. Davidzon, G. De Lucia, S. de la Torre, A. Fritz, P. Franzetti, M. Fumana, B. Garilli, O. IlbertA. Lovino, J. Krywult, V. Le Brun, O. Le Fèvre, D. Maccagni, K. Małek, F. Marulli, H. J. McCracken, M. Polletta, A. Pollo, M. Scodeggio, L. A. M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, A. Burden, C. Di Porto, A. Marchetti, C. Marinoni, Y. Mellier, T. Moutard, L. Moscardini, R. C. Nichol, J. A. Peacock, W. J. Percival, G. Zamorani

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Abstract

Aims - Using the VIMOS Public Extragalactic Redshift Survey (VIPERS) we aim to jointly estimate the key parameters that describe the galaxy density field and its spatial correlations in redshift space.

Methods - We use the Bayesian formalism to jointly reconstruct the redshift-space galaxy density field, power spectrum, galaxy bias and galaxy luminosity function given the observations and survey selection function. The high-dimensional posterior distribution is explored using the Wiener filter within a Gibbs sampler. We validate the analysis using simulated catalogues and apply it to VIPERS data taking into consideration the inhomogeneous selection function.

Results - We present joint constraints on the anisotropic power spectrum as well as the bias and number density of red and blue galaxy classes in luminosity and redshift bins as well as the measurement covariances of these quantities. We find that the inferred galaxy bias and number density parameters are strongly correlated although these are only weakly correlated with the galaxy power spectrum. The power spectrum and redshift-space distortion parameters are in agreement with previous VIPERS results with the value of the growth rate fσ8 = 0.38$ with 18% uncertainty at redshift 0.7.
Original languageEnglish
Article numberA61
JournalChemistry
Volume583
Early online date28 Oct 2015
DOIs
Publication statusPublished - Nov 2015

Keywords

  • astro-ph.CO
  • large-scale structure of Universe
  • cosmology: observations
  • galaxies: statistics
  • cosmological parameters
  • methods: statistical
  • methods: data analysis
  • RCUK
  • STFC
  • ST/I001204/1

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