Open AccessThe influence of systematic effects on the determination of the primordial helium abundance
Author(s) -
Oleg A. Kurichin,
P. A. Kislitsyn,
A. V. Ivanchik
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.150
Subject(s) - physics , big bang nucleosynthesis , astrophysics , cosmology , abundance (ecology) , helium , nucleosynthesis , galaxy , planck , consistency (knowledge bases) , universe , systematic error , supernova , statistics , biology , atomic physics , geometry , mathematics , fishery
Various tests of the Primordial Nucleosynthesis (PN) theory and Early Universe cosmology require an accurate determinationof the primordial helium abundance (Y p ). Metal decient HII regions located in blue compact dwarf (BCD) galaxies arecommonly used to determine Y p . Since the measured uxes of He and H lines emitted from such objects often deviate fromtheir pure recombination values due to the inuence of several systematic eects, one has to correctly account for theseeects to determine Y p with high accuracy. In this paper, we present an updated estimate of Y p based on analyses of a largesample of SDSS objects and objects from HeBCD+NIR database. Using improved treatment of the HII region systematicswe obtain Y p = 0.2466 ± 0.0019, which is the most accurate estimate up to date, and is in good consistency with otherindependent estimates as well as the PN+Planck prediction of Y p = 0.2470 ± 0.0002.