Fig. A.4
Ratio maps of the ionized gas in W51. a) Continuum ratio S15 GHz/S5 GHz. For α = −0.1, an optically thin free-free source, the ratio is 0.9, while for α = 2, an optically thick source, the ratio is 9. b) The ratio of the H77α peak to the H112α peak. c) The line-to-continuum ratio H112α/S5 GHz. d) The line-to-continuum ratio H77α/S15 GHz.
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