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The azimuthal variation of the HII region oxygen abundance in spiral galaxiesis a key observable for understanding how quickly oxygen produced by massivestars can be dispersed within the surrounding interstellar medium.Observational constraints on the prevalence and magnitude of such azimuthalvariations remain rare in the literature. Here, we report the discovery ofpronounced azimuthal variations of HII region oxygen abundance in NGC 2997, aspiral galaxy at approximately 11.3 Mpc. Using 3D spectroscopic data from theTYPHOON Program, we study the HII region oxygen abundance at a physicalresolution of 125 pc. Individual HII regions or complexes are identified in the3D optical data and their strong emission line fluxes measured to constraintheir oxygen abundances. We find 0.06 dex azimuthal variations in the oxygenabundance on top of a radial abundance gradient that is comparable to thoseseen in other star-forming disks. At a given radial distance, the oxygenabundances are highest in the spiral arms and lower in the inter-arm regions,similar to what has been reported in NGC 1365 using similar observations. Wediscuss whether the azimuthal variations could be recovered when the galaxy isobserved at worse physical resolutions and lower signal-to-noise ratios.

Azimuthal variations of gas-phase oxygen abundance in NGC 2997