The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping ...

• Main Authors: Poetrodjojo, Henry, Groves, Brent, Kewley, Lisa J., Medling, Anne M., Sweet, Sarah, van de Sande, Jesse, Sanchez, Sebastian F., Bland-Hawthorn, Joss, Brough, Sarah, Bryant, Julia J., Cortese, Luca, Croom, Scott M., López-Sánchez, Ángel R., Richards, Samuel N., Zafar, Tayyaba, Lawrence, Jon S., Lorente, Nuria P.F., Owers, Matt S., Scott, Nicholas
• Format: Text
• Language: unknown
• Published: Swinburne 2024
• Subjects: sami
• Online Access: https://dx.doi.org/10.25916/sut.26248031.v1; https://figshare.swinburne.edu.au/articles/journal_contribution/The_SAMI_galaxy_survey_Spatially_resolved_metallicity_and_ionization_mapping/26248031/1

We present gas-phasemetallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R23) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because HII regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (Re), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from -0.03 to -0.20 dex/Re. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either ...