Oxygen abundance maps of CALIFA galaxies
I. A. Zinchenko, L. S. Pilyugin, E. K. Grebel, S. F. Sanchez, J. M., Vilchez

TL;DR
This study creates detailed oxygen abundance maps for 88 CALIFA galaxies, analyzing their distribution, azimuthal symmetry, and radial gradients, revealing mostly symmetric abundance patterns with some central flattening.
Contribution
First comprehensive analysis of oxygen abundance maps across a large galaxy sample, including azimuthal symmetry and gradient break investigations.
Findings
No significant azimuthal asymmetry detected.
Radial abundance gradient often flattens in galaxy centers.
Geometrical parameters from abundance maps closely match photometric estimates.
Abstract
We construct maps of the oxygen abundance distribution across the disks of 88 galaxies using CALIFA data release 2 (DR2) spectra. The position of the center of a galaxy (coordinates on the plate) were also taken from the CALIFA DR2. The galaxy inclination, the position angle of the major axis, and the optical radius were determined from the analysis of the surface brightnesses in the SDSS and bands of the photometric maps of SDSS data release 9. We explore the global azimuthal abundance asymmetry in the disks of the CALIFA galaxies and the presence of a break in the radial oxygen abundance distribution. We found that there is no significant global azimuthal asymmetry for our sample of galaxies, i.e., the asymmetry is small, usually lower than 0.05 dex. The scatter in oxygen abundances around the abundance gradient has a comparable value, dex. A significant…
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