• Wang, Yuting
;
• Zhao, Gong-Bo
;
• Chuang, Chia-Hsun
;
• Ross, Ashley J.
;
• Percival, Will J.
;
• Gil-Marín, Héctor
;
• 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
;
• Sánchez, Ariel G.
;
• Salazar-Albornoz, Salvador
;
• Thomas, Daniel
;
• Tinker, Jeremy
;
• Tojeiro, Rita
;
• Vargas-Magaña, Mariana
;
• Zhu, Fangzhou

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 w₀ and w_a from nine-bin constraints are slightly improved when compared to the three-bin constraint result.