The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample

We present cosmological results from the final galaxy clustering data set of the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. Our combined galaxy sample comprises 1.2 million massive galaxies over an effective area of 9329 deg<sup>2</sup> and volume...

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Autor principal: Scóccola, Claudia Graciela
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Astronómicas
Cosmology: observations
distance scale
Large-scale structure of universe
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87260
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87260
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Cosmology: observations
distance scale
Large-scale structure of universe
spellingShingle Ciencias Astronómicas
Cosmology: observations
distance scale
Large-scale structure of universe
Scóccola, Claudia Graciela
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
topic_facet Ciencias Astronómicas
Cosmology: observations
distance scale
Large-scale structure of universe
description We present cosmological results from the final galaxy clustering data set of the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. Our combined galaxy sample comprises 1.2 million massive galaxies over an effective area of 9329 deg<sup>2</sup> and volume of 18.7 Gpc<sup>3</sup>, divided into three partially overlapping redshift slices centred at effective redshifts 0.38, 0.51 and 0.61. We measure the angular diameter distance D<sub>M</sub> and Hubble parameter H from the baryon acoustic oscillation (BAO) method, in combinationwith a cosmic microwave background prior on the sound horizon scale, after applying reconstruction to reduce non-linear effects on the BAO feature. Using the anisotropic clustering of the pre-reconstruction density field, we measure the product D<sub>M</sub>H from the Alcock-Paczynski (AP) effect and the growth of structure, quantified by fσ<sub>8</sub>(z), from redshift-space distortions (RSD). We combine individual measurements presented in seven companion papers into a set of consensus values and likelihoods, obtaining constraints that are tighter and more robust than those from any one method; in particular, the AP measurement from sub-BAO scales sharpens constraints from post-reconstruction BAOs by breaking degeneracy between D<sub>M</sub> and H. Combined with Planck 2016 cosmic microwave background measurements, our distance scale measurements simultaneously imply curvature Ω<sub>K</sub> = 0.0003 ± 0.0026 and a dark energy equation-of-state parameter ω =-1.01 ± 0.06, in strong affirmation of the spatially flat cold dark matter (CDM) model with a cosmological constant (ΛCDM). Our RSD measurements of fσ8, at 6 per cent precision, are similarly consistent with this model. When combined with supernova Ia data, we find H<sub>0</sub> = 67.3 ± 1.0 kms<sup>-1</sup> Mpc<sup>-1</sup> even for our most general dark energy model, in tension with some direct measurements. Adding extra relativistic species as a degree of freedom loosens the constraint only slightly, to H<sub>0</sub> = 67.8 ± 1.2 kms-1 Mpc<sup>-1</sup>. Assuming flat ΛCDM, we find Ω<sub>m</sub> = 0.310 ± 0.005 and H<sub>0</sub> = 67.6 ± 0.5 kms<sup>-1</sup> Mpc<sup>-1</sup>, and we find a 95 per cent upper limit of 0.16 eV c<sup>-2</sup> on the neutrino mass sum.
format Articulo
Articulo
author Scóccola, Claudia Graciela
author_facet Scóccola, Claudia Graciela
author_sort Scóccola, Claudia Graciela
title The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
title_short The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
title_full The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
title_fullStr The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
title_full_unstemmed The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
title_sort clustering of galaxies in the completed sdss-iii baryon oscillation spectroscopic survey: cosmological analysis of the dr12 galaxy sample
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87260
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