Fig. 23.
Left: continuum-subtracted [S II] image of diffuse ionized gas in field (a). Contours are set to surface brightness levels of 0.5, 1.0, and 1.5 × 10−17 erg cm−2 s−1 arcsec−2. Right: diagnostic diagram to distinguish photoionization from shock excitation according to Sabbadin et al. (1977). Red plot symbols correspond to shock ionized filaments aD03 … aD09, aD15 … aD17, etc., and blue symbols to photoionized local surface brightness mimima aD02, aD14, aD18 (see text).
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