The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in Fourier space
/ Authors
Gong-Bo Zhao, Yuting Wang, S. Saito, Dandan Wang, A. Ross, F. Beutler, J. Grieb, C. Chuang, F. Kitaura, Sergio A. Rodríguez-Torres
and 18 more authors
W. Percival, J. Brownstein, A. Cuesta, D. Eisenstein, H. Gil-Mar'in, J. Kneib, R. Nichol, M. Olmstead, F. Prada, G. Rossi, Salvador Salazar-Albornoz, L. Samushia, Ariel G. S'anchez, D. Thomas, J. Tinker, R. Tojeiro, D. Weinberg, Fangzhou Zhu
/ 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.
Journal: Monthly Notices of the Royal Astronomical Society