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Wang, Yuting; Zhao, Gong-Bo; Chuang, Chia-Hsun; Ross, Ashley J.; Percival, Will J.; Gil-Marin, Hector; Cuesta, Antonio J.; Kitaura, Francisco-Shu; Rodriguez-Torres, Sergio; Brownstein, Joel R.; Eisenstein, Daniel J.; Ho, Shirley; Kneib, Jean-Paul; Olmstead, Matthew D.; Prada, Francisco; Rossi, Graziano; Sanchez, Ariel G.; Salazar-Albornoz, Salvador; Thomas, Daniel; Tinker, Jeremy; Tojeiro, Rita; Vargas-Magana, Mariana; Zhu, Fangzhou (2017): The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in configuration space. In: Monthly Notices of the Royal Astronomical Society, Vol. 469, No. 3: pp. 3762-3774
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Abstract

We perform a tomographic baryon acoustic oscillations (BAOs) analysis using the two-point galaxy correlation function measured from the combined sample of Baryon Oscillation Spectroscopic Survey Data Release 12 (BOSS DR12), which covers the redshift range of 0.2 < z < 0.75. Upon splitting the sample into multiple overlapping redshift slices to extract the redshift information of galaxy clustering, we obtain a measurement of D-A(z)/r(d) and H(z)r(d) at nine effective redshifts with the full covariance matrix calibrated using MultiDark-Patchy mock catalogues. Using the reconstructed galaxy catalogues, we obtain the precision of 1.3-2.2 per cent for D-A(z)/r(d) and 2.1-6.0 per cent for H(z)r(d.) To quantify the gain from the tomographic information, we compare the constraints on the cosmological parameters using our nine-bin BAO measurements, the consensus three-bin BAO and redshift space distortion measurements at three effective redshifts in Alam et al., and the non-tomographic (one-bin) BAO measurement at a single effective redshift. Comparing the nine-bin with one-bin constraint result, it can improve the dark energy Figure of Merit by a factor of 1.24 for the Chevallier-Polarski-Linder parametrization for equation-of-state parameter w(DE). The errors of w(0) and w(a) from nine-bin constraints are slightly improved when compared to the three-bin constraint result.