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The VIMOS Public Extragalactic Redshift Survey (VIPERS): The growth of structure at 0.5 < z < 1.2 from redshift-space distortions in the clustering of the PDR-2 final sample
The VIMOS Public Extragalactic Redshift Survey (VIPERS): The growth of structure at 0.5 < z < 1.2 from redshift-space distortions in the clustering of the PDR-2 final sample
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩, Astron.Astrophys., Astron.Astrophys., 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩
- Publication Year :
- 2017
-
Abstract
- We present measurements of the growth rate of cosmological structure from the modelling of the anisotropic galaxy clustering measured in the final data release of the VIPERS survey. The analysis is carried out in configuration space and based on measurements of the first two even multipole moments of the anisotropic galaxy auto-correlation function, in two redshift bins spanning the range $0.5 < z < 1.2$. We provide robust and cosmology-independent corrections for the VIPERS angular selection function, allowing recovery of the underlying clustering amplitude at the percent level down to the Mpc scale. We discuss several improvements on the non-linear modelling of redshift-space distortions (RSD) and perform detailed tests of a variety of approaches against a set of realistic VIPERS-like mock realisations. This includes using novel fitting functions to describe the velocity divergence and density power spectra $P_{\theta\theta}$ and $P_{\delta\theta}$ that appear in RSD models. These tests show that we are able to measure the growth rate with negligible bias down to separations of $5h^{-1}Mpc$. Interestingly, the application to real data shows a weaker sensitivity to the details of non-linear RSD corrections compared to mock results. We obtain consistent values for the growth rate times the matter power spectrum normalisation parameter of $f\sigma_8=0.55\pm 0.12$ and $0.40\pm0.11$ at effective redshifts of $z = 0.6$ and $z=0.86$ respectively. These results are in agreement with standard cosmology predictions assuming Einstein gravity in a $\Lambda \rm{CDM}$ background.<br />Comment: 17 pages, 19 figures
- Subjects :
- statistics [galaxies]
Large-scale structure of Universe
observation [Cosmology]
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Cosmology: observation
Cosmology
Redshift-space distortions
0103 physical sciences
Sensitivity (control systems)
010303 astronomy & astrophysics
galaxies: statistics
Physics
statistic [Galaxies]
010308 nuclear & particles physics
Matter power spectrum
Galaxies: statistic
Galaxies: high-redshift
Astronomy and Astrophysics
Astronomy and Astrophysic
Redshift survey
Redshift
Galaxy
observations [cosmology]
Space and Planetary Science
cosmology: observations
Cosmology: observations
Galaxies: statistics
large-scale structure of Universe
Multipole expansion
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
high-redshift [galaxies]
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩, Astron.Astrophys., Astron.Astrophys., 2017, 604, pp.A33. ⟨10.1051/0004-6361/201630295⟩
- Accession number :
- edsair.doi.dedup.....e6d910c935b7919fc79426d90b53ad3c
- Full Text :
- https://doi.org/10.1051/0004-6361/201630295⟩