MIRI spectroscopy detects [NeV] and [OIV] in IZw18; line-ratio modeling favors metal-poor stars plus ULXs over shocks or an AGN as the ionization source.
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The Interstellar Medium in IZw18 seen with JWST/MIRI: I. Highly Ionized Gas
MIRI spectroscopy detects [NeV] and [OIV] in IZw18; line-ratio modeling favors metal-poor stars plus ULXs over shocks or an AGN as the ionization source.