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Fig. 6

image

LVG calculations. We assumed N(SO) = 2 × 1013 cm-2, N(H2CO) = 1 × 1013 cm-2, and N(C18O) = 2 × 1016 cm-2. From top to bottom, we plot the I(SO J = 56 → 45)/I(C18O J = 2 → 1), I(SO J = 56 → 45)/I(H2CO J = 30,3 → 20,2), and I(H2CO J = 303 → 202)/I(C18O J = 2 → 1) line intensity ratios. The long-dashed line corresponds to a gas kinetic temperature of Tk = 30 K, which is the midplane temperature derived by Piétu et al. (2005) and Pacheco-Vázquez et al. (2015). Solid lines indicate the values derived from our maps (Fig. 5). The red and blue lines trace the maximum and minimum observed ratios, respectively.

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