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Limits to Ionization-parameter Mapping as a Diagnostic of HII Region Optical Depth

Authors: Amit N. Sawant, Eric W. Pellegrini, M. S. Oey, Jesús López-Hernández, Genoveva Micheva

Amit N. Sawant et al 2021 The Astrophysical Journal 923 .

Caption: Figure 8.

Same as Figure 6, but for IC 132. Highly ionized [O III] is seen all around the halo, indicating the escape of ionizing radiation.