Azimuthal variations of oxygen abundance profiles in star-forming regions of disc galaxies in the EAGLE simulations

Abstract

The exploration of the spatial distribution of chemical abundances in star-forming regions in galactic discs provides clues to understand the complex interplay of physical processes that regulate the star formation activity and the chemical enrichment across a galaxy. We study the azimuthal variations of the normalized oxygen abundance profiles in the highest numerical resolution run of the Evolution and Assembly of GaLaxies and their Environments (EAGLE) Project at $z=0$. We use young stellar populations to trace the abundances of star-forming regions. Oxygen profiles are estimated along different line of sights from a centrally located observer.The mean azimuthal variation in the EAGLE discs are $\sim 0.12\pm 0.03$~dex~$R_{\mathrm{eff}}^{-1}$ for slopes and $\sim 0.12\pm 0.03$~dex for the zero points, in agreement with previous works. Metallicity gradients measured along random directions correlate with those determine by averaging over the whole discs although with a large dispersion. We find a slight trend for higher azimuthal variations in the disc components of low star-forming and bulge-dominated galaxies. We also investigate the metallicity profiles of stellar populations with higher and lower levels of enrichment than the average metallicity profiles, and we find that high star-forming region with high metallicity tend to have slightly shallower metallicity slopes compared with the overall metallicity gradient. The simulated azimuthal variations in the EAGLE discs are in global agreement with observations, although the large variety of metallicity gradients would encourage further exploration of the metal mixing in numerical simulations.

9 pages, 7 figures, Accepted MNRAS. revised version to match published version

References in corpus (15)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• The effect of photo-ionization on the cooling rates of enriched, astrophysical plasmas
• Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
• Angular momentum evolution of galaxies in EAGLE
• The Structure and Dynamical Evolution of the Stellar Disk of a Simulated Milky Way-Mass Galaxy
• The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365
• Chemical mixing in smoothed particle hydrodynamics simulations
• Evidence of ongoing radial migration in NGC 6754: Azimuthal variations of the gas properties
• Oxygen abundance maps of CALIFA galaxies
• Resolved galaxy scaling relations in the EAGLE simulation: star formation, metallicity and stellar mass on kpc scales
• Interaction effects on galaxy pairs with Gemini/GMOS- II: Oxygen abundance gradients
• The role of gas infall in the evolution of disc galaxies
• Arm and interarm abundance gradients in CALIFA spiral galaxies
• The evolution of the metallicity gradient and the star formation efficiency in disc galaxies

Cited by in corpus (2)

• The evolution of the oxygen abundance gradients in star-forming galaxies in the EAGLE simulations
• The MAGIC project. III. Radial and azimuthal Galactic abundance gradients using classical Cepheids