BAO angular scale at z_eff = 0.11 with the SDSS blue galaxies

¹ Centro de Estudos Superiores de Tabatinga, Universidade do Estado do Amazonas, 69640-000 Tabatinga, AM, Brazil
e-mail: edfilho@uea.edu.br
² Observatório Nacional, Rua General José Cristino 77, São Cristóvão, 20921-400 Rio de Janeiro, RJ, Brazil
³ Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas 1758, Jardim da Granja, São José dos Campos, SP, Brazil

Received: 18 November 2020
Accepted: 18 March 2021

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 2.2σ. 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.