Chemical abundances in 7 metal-poor HII regions and a determination of the primordial helium abundance

Abstract

We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor HII regions in three galaxies: UM 160, UM 420, and TOL 0513-393. The data have been taken with the Focal Reducer Low Dispersion Spectrograph 1 (FORS1) at the 8.2-m Very Large Telescope. We derived the physical conditions and the chemical abundances of N, O, Ne, S, Ar, and Cl. We also performed a detailed analysis that involves abundance determinations using the $t^2$ formalism. Based on HeI recombination line intensity ratios, together with the Helio14 code, we derived the abundance of He. In addition, for a value $\Delta Y/\Delta Z_O=3.3\pm 0.7$, we have estimated that the primordial helium abundance by mass is $Y_{\mathrm{P}}=0.2448\pm 0.0033$. This value agrees with values derived from Standard Big Bang Nucleosynthesis and with other recent determinations of $Y_{\mathrm{P}}$.

arXiv comment11 pages, 4 figures. This paper has been accepted in MNRAS

References in corpus (43)

• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Precision Electroweak Measurements on the Z Resonance
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• The effects of He I 10830 on helium abundance determinations
• The most metal-poor galaxies
• The impact of the nitrogen-to-oxygen ratio on ionized nebulae diagnostics based on [NII] emission lines
• 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
• Resolving the electron temperature discrepancies in HII Regions and Planetary Nebulae: kappa-distributed electrons
• The primordial abundance of 4He: a self-consistent empirical analysis of systematic effects in a large sample of low-metallicity HII regions
• Synthetic spectra of H Balmer and HeI absorption lines. II: Evolutionary synthesis models for starburst and post-starburst galaxies
• The Chemical Composition of the Small Magellanic Cloud H II Region NGC 346 and the Primordial Helium Abundance
• Metallicities and Physical Conditions in Star-forming Galaxies at z~1.0-1.5
• Keck HIRES Spectroscopy of Extragalactic HII Regions: C and O Abundances from Recombination Lines
• On the abundance discrepancy problem in HII regions
• Measurement of the neutron lifetime using an asymmetric magneto- gravitational trap and in situ detection
• Heavy elements in Galactic and Magellanic Cloud HII regions: recombination-line versus forbidden-line abundances
• Ionization Correction Factors for Planetary Nebulae: I- Using optical spectra
• Nebular spectroscopy: A guide on H II regions and planetary nebulae
• Temperature Bias and the Primordial Helium Abundance Determination
• Discovery of Eight New Extremely Metal--Poor Galaxies in the Sloan Digital Sky Survey
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• Improving Helium Abundance Determinations with Leo P as a Case Study
• Carbon and oxygen in HII regions of the Magellanic Clouds: abundance discrepancy and chemical evolution
• Chemical Composition of Two H II Regions in NGC 6822 Based on VLT Spectroscopy
• Neon and Argon optical emission lines in ionized gaseous nebulae: Implications and applications
• A photoionization modeling study of 30 Doradus: the case for small-scale chemical inhomogeneity
• Determination of the primordial helium abundance based on NGC 346 an HII region of the Small Magellanic Cloud
• Analysis of chemical abundances in planetary nebulae with [WC] central stars. II. Chemical abundances and the abundance discrepancy factor
• A new determination of the primordial helium abundance using the analyses of HII region spectra from SDSS
• On the universality of luminosity-metallicity and mass-metallicity relations for compact star-forming galaxies at redshifts 0 < z < 3
• HI study of extremely metal-deficient dwarf galaxies. I. The Nancay Radio Telescope observations of twenty-two objects
• A Bayesian direct method implementation to fit emission line spectra: Application to the primordial He abundance determination
• Carbon, nitrogen and oxygen abundance gradients in M101 and M31
• MMT Extremely Metal Poor Galaxy Survey I. An Efficient Technique to Identify Metal Poor Galaxies
• Analysis of two SMC HII Regions Considering Thermal Inhomogeneities: Implications for the Determinations of Extragalactic Chemical Abundances
• Near-infrared spectroscopy of five Blue Compact Dwarf galaxies: II Zw 40, Mrk 71, Mrk 930, Mrk 996 and SBS 0335-052E
• Uncertainties in Theoretical HeI Emissivities: HII Regions, Primordial Abundance, and Cosmological Recombination
• On the influence of the environment on galactic chemical abundances
• The last 5 Gyr of Galactic chemical evolution based on H II region abundances derived from a temperature independent method
• A classification of HII regions based on Oxygen and Helium lines: The cases of TOL2146-391 and TOL0357-3915
• The abundance discrepancy in H II regions

Cited by in corpus (19)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Gradients of chemical abundances in the Milky Way from HII regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
• JADES: The star-formation and chemical enrichment history of a luminous galaxy at z~9.43 probed by ultra-deep JWST/NIRSpec spectroscopy
• Primordial lepton asymmetries in the precision cosmology era: Current status and future sensitivities from BBN and the CMB
• Characterization of Population III Stars with Stellar Atmosphere and Evolutionary Modeling and Predictions of their Observability with the James Webb Space Telescope
• Chemical abundances in Seyfert galaxies -IX. Helium abundance estimates
• Gas-phase Fe/O and Fe/N abundances in Star-Forming Regions. Relations between nucleosynthesis, metallicity and dust
• A New Precise Determination of the Primordial Abundance of Deuterium: Measurement in the metal-poor sub-DLA system at z=3.42 towards quasar J1332+0052
• Determination of HII region metallicity in the context of estimating the primordial helium abundance
• Neutron Lifetime Anomaly and Big Bang Nucleosynthesis
• A coherent view of Li depletion and angular momentum transport to explain the Li plateau -- from Population II to Population I stars
• An Empirical Calibration of the Helium Abundance in HII Regions based in Literature and CALIFA Survey data
• Early Dark Energy During Big Bang Nucleosynthesis
• Cosmological Parameter Estimation with a Joint-Likelihood Analysis of the Cosmic Microwave Background and Big Bang Nucleosynthesis
• BBN Constraints on the Hadronic Annihilation of sub-GeV Dark Matter
• New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis
• Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look
• Insights for Early Dark Energy with Big Bang Nucleosynthesis
• Primordial helium-3 redux: The helium isotope ratio of the Orion nebula