Fig. 9

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Mapping electron temperatures within H ii regions across four of the PHANGS-MUSE galaxies (NGC 1672, NGC 1365, NGC 4254, and NGC 628). Coverage is not just limited to spiral arms, but samples the full inner star-forming disks in our sample of galaxies. NGC 1365 (Ho et al. 2017) and NGC 1672 (Kreckel et al. 2019; Ho et al. 2019) have both reported azimuthal abundance variations, with enhanced abundances along the spiral arms, which is supported by decreased Te along the eastern arms in both galaxies. The more flocculent galaxy NGC 4254 and the bar-free grand design spiral galaxy NGC 628 both show some tentative azimuthal trends, but the connection with spiral structure is more tenuous. Small-scale (<1 kpc) homogeneity in the temperature distribution is reminiscent of the trends for more uniform metallicity on small scales reported in Kreckel et al. (2020) for these targets.
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