Improving Helium Abundance Determinations with Leo P as a Case Study

Abstract

Currently, the primordial helium abundance is best estimated through spectroscopic observations of H II regions in metal-poor galaxies. However these determinations are limited by several systematic uncertainties which ultimately limit our ability to accurately ascertain the primordial abundance. In this study, we improve the methodologies for solving for the reddening, the emission contributions from collisional excitation of the H I atoms, the effects underlying absorption in the H I and He I emission lines, and the treatment of the blended H I and He I emission at $\lambda$3889 with the aim of lowering the systematic uncertainties in helium abundance determinations. To apply these methods, we have obtained observations of the He I $\lambda$10830 emission line in the brightest H II region in the extremely metal-poor (3$\%$ Z${}_{\odot }$) galaxy Leo P with the LUCI1 instrument on the LBT. We combine this measurement with previous MODS/LBT observations to derive an improved helium abundance. In doing so, our present analysis results in a decrease in the uncertainty in the helium abundance of Leo P by approximately 70%. This result is combined with data from other observations to estimate the primordial helium mass fraction, Y${}_p$ $=$ 0.2453 $\pm$ 0.0034.

arXiv comment30 pages, 3 figures

References in corpus (66)

• Planck 2015 results. XIII. Cosmological parameters
• The chemical composition of the Sun
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Big Bang Nucleosynthesis: 2015
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• Gas-to-Dust mass ratios in local galaxies over a 2 dex metallicity range
• Primordial Nucleosynthesis in the Precision Cosmology Era
• One percent determination of the primordial deuterium abundance
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• Primordial Nucleosynthesis: Theory and Observations
• The 2013 Release of Cloudy
• CMB-S4 Science Case, Reference Design, and Project Plan
• The effects of He I 10830 on helium abundance determinations
• New BBN limits on Physics Beyond the Standard Model from He4
• Precision big bang nucleosynthesis with improved Helium-4 predictions
• Big-Bang Nucleosynthesis After Planck
• Updated Big Bang Nucleosynthesis confronted to WMAP observations and to the Abundance of Light Elements
• Direct Oxygen Abundances for Low Luminosity LVL Galaxies
• Precision measures of the primordial abundance of deuterium
• Evolutionary Stellar Population Synthesis at High Spectral Resolution: Optical Wavelengths
• Relic neutrino decoupling with flavour oscillations revisited
• A Bitter Pill: The Primordial Lithium Problem Worsens
• Spectral synthesis including massive binaries
• Systematic effects and a new determination of the primordial abundance of 4He and dY/dZ from observations of blue compact galaxies
• Primordial Nucleosynthesis for the New Cosmology: Determining Uncertainties and Examining Concordance
• Primordial Nucleosynthesis in Light of WMAP
• A precision calculation of relic neutrino decoupling
• PArthENoPE: Public Algorithm Evaluating the Nucleosynthesis of Primordial Elements
• The primordial abundance of 4He: evidence for non-standard big bang nucleosynthesis
• Nuclear Reaction Network for Primordial Nucleosynthesis: a detailed analysis of rates, uncertainties and light nuclei yields
• A new determination of the primordial He abundance using the HeI 10830A emission line: cosmological implications
• A Realistic Determination of the Error on the Primordial Helium Abundance: Steps Toward Non-Parametric Nebular Helium Abundances
• Revised Primordial Helium Abundance Based on New Atomic Data
• The primordial abundance of 4He: a self-consistent empirical analysis of systematic effects in a large sample of low-metallicity HII regions
• Associations of Dwarf Galaxies
• A High-Resolution Stellar Library for Evolutionary Population Synthesis
• A New Approach to Systematic Uncertainties and Self-Consistency in Helium Abundance Determinations
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. III. An Extremely Metal Deficient Galaxy
• The primordial helium abundance from updated emissivities
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo P. I. HI Observations
• The primordial deuterium abundance of the most metal-poor damped Lyman-alpha system
• The NACRE Thermonuclear Reaction Compilation and Big Bang Nucleosynthesis
• Present status of primordial nucleosynthesis after WMAP: results from a new BBN code
• Temperature Bias and the Primordial Helium Abundance Determination
• Improved He I Emissivities in the Case B Approximation
• Corrigendum: Improved He~I Emissivities in the Case B Approximation
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• On the O/H, Mg/H, Si/H and Fe/H Gas and Dust Abundance Ratios in Galactic and Extragalactic H II Regions
• Radiative Transfer Effects in He I Emission Lines
• Primordial Nucleosynthesis with CMB Inputs: Probing the Early Universe and Light Element Astrophysics
• Primordial 4He abundance: a determination based on the largest sample of HII regions with a methodology tested on model HII regions
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. II. Optical Imaging Observations
• The primordial deuterium abundance: subDLA system at $z_{\mathrm{abs}}=2.437$ towards the QSO J1444+2919
• An MCMC determination of the primordial helium abundance
• He~I Emission in the Orion Nebula and Implications for Primordial Helium Abundance
• A robust deuterium abundance; Re-measurement of the z=3.256 absorption system towards the quasar PKS1937-1009
• Results from the Wilkinson Microwave Anisotropy Probe
• Determination of the primordial helium abundance based on NGC 346 an HII region of the Small Magellanic Cloud
• A precise deuterium abundance: Re-measurement of the z=3.572 absorption system towards the quasar PKS1937-101
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo P. IV. Distance Measurement from LBT Optical Imaging
• Mapping systematic errors in helium abundance determinations using Markov Chain Monte Carlo
• A Bayesian direct method implementation to fit emission line spectra: Application to the primordial He abundance determination
• On the Determination of the He Abundance in Extragalactic H II Regions
• Measurement of the primordial helium abundance from the intergalactic medium

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