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

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Volume 508 / No 2 (December III 2009)

A&A, 508 2 (2009) 737-749

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Table 4:

Results of rotational diagrams and LVG analysis.
Rotational diagram
Source	$T_{\rm rot}$ (DCN)	$N_{\rm DCN}$	$T_{\rm rot}$ (H¹³CN)	$N_{\rm H^{13}CN}$	DCN/HCN^*
	(K)	(10¹³ cm^-2)	(K)	(10¹³ cm^-2)	(%)
clump 1	14.0 $\pm$ 1.1	1.4 $\pm$ 0.3	10.5 $\pm$ 0.4	3.1 $\pm$ 0.4	0.7 $\pm$ 0.2
clump 3	11.9 $\pm$ 0.5	1.9 $\pm$ 0.3	9.9 $\pm$ 0.4	2.5 $\pm$ 0.3	1.1 $\pm$ 0.2
LVG analysis
Source	$T_{\rm kin}$ [DCN]	$N_{\rm DCN}$	$T_{\rm kin}$ [H¹³CN]	$N_{\rm H^{13}CN}$	DCN/HCN^*
	(K)	(10¹³ cm^-2)	(K)	(10¹³ cm^-2)	(%)
clump 1	$\rm 18^{+5}_{-3}$	$\rm 1.4^{+0.4}_{-0.3}$	$\rm 21^{+3}_{-2}$	$\rm 8.2^{+2.8}_{-2.2}$	0.3 $\pm$ 0.1
clump 3	$\rm 32^{+13}_{-7}$	$\rm 1.0^{+0.4}_{-0.3}$	$\rm 26^{+4}_{-3}$	$\rm 1.9^{+0.4}_{-0.3}$	0.8 $\pm$ 0.3

Given error bars are 1 $\sigma$ . We note that the $T_{\rm kin}$ derived from LVG analysis of DCN and H¹³CN are consistent within the 3 $\sigma$ uncertainty range with the $T_{\rm kin}$ values derived from methanol.
^* Assuming HCN/H¹³CN = 70 (Wilson 1999).

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