BAO angular scale at<i>z</i><sub>eff</sub>= 0.11 with the SDSS blue galaxies
Edilson de Carvalho, Armando Bernui, Felipe Avila, Camila P. Novaes, J. P. Nogueira-Cavalcante
Abstract
Aims. We measure the transverse baryon acoustic oscillations (BAO) signal in the local Universe using a sample of blue galaxies from the Sloan Digital Sky Survey (SDSS) survey as a cosmological tracer. Methods. The method is weakly dependent on a cosmological model and is suitable for 2D analyses in thin redshift bins to investigate the SDSS data in the interval z ∈ [0.105, 0.115]. Results. We detect the transverse BAO signal θ BAO = 19.8°±1.05° at z eff = 0.11, with a statistical significance of 2.2 σ . Additionally, we perform tests that confirm the robustness of this angular BAO signature. Supported by a large set of log-normal simulations, our error analyses include statistical and systematic contributions. In addition, considering the sound horizon scale calculated by the Planck Collaboration, r s Planck , and the θ BAO value obtained here, we obtain a measurement of the angular diameter distance D A (0.11) =258.31 ± 13.71 h −1 Mpc. Moreover, combining this θ BAO measurement at low redshift with other BAO angular scale data reported in the literature, we perform statistical analyses for the cosmological parameters of some Lambda cold dark matter type models.