Fig. 7.
Diagnostic diagram of the apertures in the central kiloparsec of NGC 1672. The location of the apertures is indicated in the flux maps in Fig. 3. The flux ratios of the molecular hydrogen lines H2(2–1)S(1)λ2.248 μm/H2(1–0)S(1)λ2.122 μm and H2(1–0)S(2)λ2.034 μm/H2(1–0)S(0)λ2.223 μm are used (Mouri 1994; Rodríguez-Ardila et al. 2004, 2005). Models for thermal UV excitation (Sternberg & Dalgarno 1989), non-thermal excitation (Black & van Dishoeck 1987), X-ray heating (Draine & Woods 1990), and shock-heating (Brand et al. 1989) are indicated for comparison.
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