2015/07/31 by G. C. Carvalho, A. Bernui, M. Benetti +2 · 1 citation
Physics and Astronomy · #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.93.023530
published as Phys. Rev. D 93, 023530 (2016) · 9 pages, 5 figures
arxiv created 2016/03/03 · arxiv updated 2016/03/04
The 2-point angular correlation function w(θ) (2PACF), where θ is the angular separation between pairs of galaxies, provides the transversal Baryon Acoustic Oscillation (BAO) signal almost model-independently. In this paper we use 409,337 luminous red galaxies in the redshift range z = [0.440,0.555] obtained from the tenth data release of the Sloan Digital Sky Survey (SDSS DR10) to estimate θ_\rmBAO(z) from the 2PACF at six redshift shells. Since noise and systematics can hide the BAO signature in the w - θ plane, we also discuss some criteria to localize the acoustic bump. We identify two sources of model-dependence in the analysis, namely, the value of the acoustic scale from Cosmic Microwave Background (CMB) measurements and the correction in the θ_\rmBAO(z) position due to projection effects. Constraints on the dark energy equation-of-state parameter w(z) from the θ_\rmBAO(z) diagram are derived, as well as from a joint analysis with current CMB measurements. We find that the standard ΛCDM model as well as some of its extensions are in good agreement with these θ_\rmBAO(z) measurements.