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Table 3

Priors used in the models for the molecules of interest.

CH3CN Temperature Column density Linewidth Velocity
[K] [log(cm-2)] [km s-1] [km s-1]

Prior Truncated normal Normal Truncated normal Normal
Parameters (cool) μ = 50 μ = 14 μ = 4 μ = VLSR a
σ = 15 σ = 1.5 σ = 2 σ = 1
low = 8,high = 100 low = 0.5,high = 34
Parameters (hot) μ = 150 μ = 17 μ = 7 μ = VLSR a
σ = 80 σ = 2 σ = 2
low = 100,high = 650 low = 1.5,high = 37

CH3CCH Temperature Column density Linewidth Velocity
[K] [log(cm-2)] [km s-1] [km s-1]

Prior Truncated normal Normal Truncated normal Normal
Parameters μ = 50 μ = 14 μ = 4 μ = VLSR a
σ = 15 σ = 1.5 σ = 2 σ = 1
low = 8,high = 150 low = 0.5,high = 34

CH3OH Temperature Column density Linewidth Velocity
[K] [log(cm-2)] [km s-1] [km s-1]

Prior Truncated normal Normal Truncated normal Normal
Parameters (cool) μ = 20 μ = 14 μ = 4 μ = VLSR a
σ = 30 σ = 1.5 σ = 3 σ = 1
low = 8,high = 100 low = 0.5,high = 12
Parameters (hot) μ = 200 μ = 18 μ = 7 μ = VLSR a
σ = 50 σ = 1.5 σ = 3
low = 100,high = 700 low = 1,high = 17

Notes.

(a)

The mean for the radial velocity is set equal to the measured velocity in C17O (3–2) from Giannetti et al. (2014; if C17O J = 3 → 2 was not detected, we use the velocity of N2H+J = 1 → 0 from the 3 mm surveys; see Urquhart et al., in prep., and Csengeri et al. 2016).

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