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 ÎCDM model, with density parameter Î©Mh = 0.227+0.063-0.050Î©Mh=0.227-0.050+0.063 and baryon fraction fB=Î©B/Î©M=0.220+0.058-0.072fB=Î©B/Î©M=0.220-0.072+0.058. 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 ÎCDM model gives a good match to cosmic structure at all redshifts currently accessible to observational study.
|Titolo:||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|
|Parole Chiave:||Cosmological parameters; Galaxies: high-redshift; Galaxies: statistics; Large-scale structure of Universe; Astronomy and Astrophysics; Space and Planetary Science|
|Settore Scientifico Disciplinare:||Settore FIS/05 - Astronomia e Astrofisica|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||10.1051/0004-6361/201630116|
|Appare nelle tipologie:||01 - Articolo su periodico|