ATLASGAL-selected massive clumps in the inner Galaxy - V. Temperature structure and evolution

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Volume 603 (July 2017)

A&A, 603 (2017) A33

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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 = V_LSR ^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 = V_LSR ^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 = V_LSR ^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 = V_LSR ^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 = V_LSR ^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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