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We report one of the first extragalactic observations of electron temperaturevariations across a spiral arm. Using MUSE mosaic observations of the nearbygalaxy NGC 1672, we measure the [N II]5755 auroral line in a sample of 80 HIIregions in the eastern spiral arm of NGC1672. We discover systematictemperature variations as a function of distance perpendicular to the spiralarm. The electron temperature is lowest on the spiral arm itself and highest onthe downstream side. Photoionization models of different metallicity, pressure,and age of the ionizing source are explored to understand what properties ofthe interstellar medium drive the observed temperature variations. Anazimuthally varying metallicity appears to be the most likely cause of thetemperature variations. The electron temperature measurements solidify recentdiscoveries of azimuthal variations of oxygen abundance based on strong lines,and rule out the possibility that the abundance variations are artefacts of thestrong-line calibrations.

Mapping electron temperature variations across a spiral arm in NGC 1672