Deuterium chemistry in the Orion Bar PDR - “Warm” chemistry starring CH2D+

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Table 2:

Best-fit model results from the CH₃OH analysis towards the two clumps.
Source	S	$n_{\rm H_2}$	T	$N_{\rm CH_3OH}$	$x_{\rm CH_3OH}$
	['']	[cm^-3]	[K]	[cm^-2]
clump 1	10	$6^{+4}_{-3}\times 10^6$	$\rm 45^{+47}_{-17}$	$3^{+1}_{-1}\times 10^{14}$	2 $\times$ 10^-9
clump 3	8	$5^{+5}_{-2}\times 10^6$	$\rm 35^{+17}_{-15}$	$3^{+3}_{-1}\times 10^{14}$	2 $\times$ 10^-9

The uncertainties correspond to the $3\sigma$ confidence level. The methanol column density (N) and fractional abundance relative to H₂ (x) is computed averaged over the extent of the clumps.

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