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

Abstract

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 2 and volume of 18.7 Gpc 3 , 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 M and Hubble parameter H from the baryon acoustic oscillation (BAO) method, in combination with 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 Hubble Fellow.

The SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations at Redshift of 0.72 with the DR14 Luminous Red Galaxy Sample

“…The larger density is essential in order to obtain good performances of the reconstruction technique (Section 4.3) and better errors. By using only z>0.6 CMASS galaxies, our measurement is correlated with the higher redshift measurement of Alam et al (2017) at 0.5<z<0.75, but it is independent of the other two redshift bins (0.2 < z < 0.5 and 0.4 < z < 0.6). The final analysis of the eBOSS LRG sample will be done jointly with CMASS (z > 0.6) and the ELG sample (0.7 < z < 1.1).…”

“…In order to increase tracer density, we combine the eBOSS sample with the z>0.6 BOSS CMASS galaxies (Alam et al 2017) trimmed to the area covered by eBOSS observations. The larger density is essential in order to obtain good performances of the reconstruction technique (Section 4.3) and better errors.…”

“…Different methods to correct for the effect of collisions have been studied in the past (e.g., Guo et al 2012;Bianchi & Percival 2017). For our catalogs, we simply upweight by one the target with redshift information, as performed in Alam et al (2017). The impact on correlations larger than 10 h −1 Mpc is negligible (Guo et al 2012).…”

“…Mock catalogs were created with the quick particle mesh (QPM) method (White et al 2014), also used in recent clustering studies (Alam et al 2017;Ata et al 2018). Each realization consists of a different set of second-order Lagrangian perturbation theory (2LPT) initial conditions computed at z=25.…”

“…Results from the final sample of BOSS galaxies are presented in Alam et al (2017), while results using the final sample of BOSS Lyα forests are presented in Bautista et al (2017) and du Mas des Bourboux et al (2017).…”