Galactocentric variation of the gas-to-dust ratio and its relation with metallicity

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Table A.3

Priors used in MCWeeds.

C¹⁸O	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 = T_ex,CO ^a	μ = 14	μ = 1	μ = V_LSR ^b
	σ = 15	σ = 1.5	σ = 1	σ = 2
	low = 7,high = 100		low = 0.3,high = 6

Notes.

^(a)

The mean for the C¹⁸O excitation temperature is derived from dust temperature, using the relation in Giannetti et al. (2017).

^(b)

The mean for the radial velocity is obtained from previous observations of CO and isotopologues from König et al. (in prep.) and from Wouterloot & Brand (1989).

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