Deuterium fractionation of a distant cold dark cloud along the line of sight of W51

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Table 3

Column densities and abundances derived from LTE or non-LTE radiative transfer.

Species	V_LSR	T_ex	T_k	n(H₂)	N
	(km s^-1)	(K)	(K)	(cm^-3)	(cm^-2)

DCO⁺	69.58	3.5^a	10	2.5 × 10⁴	5 × 10¹¹
H¹³CO⁺	69.64	3.5	10	2.5 × 10⁴	4 × 10¹¹
DNC	69.52	3.0^b	10	2.5 × 10⁴	1.2 × 10¹²
HN¹³C	69.70	3.1	10	2.5 × 10⁴	1.3 × 10¹¹
o-NH₂D	68.91	5–10			0.4–1.8 × 10¹²^c
	68.90	5–10			0.2–1.1 × 10¹³^d
	68.54	5–10			1.3–6.9 × 10¹²^e
p-H₂CO	69.39	3.5^a	10	2.5 × 10⁴	5 × 10¹²

Notes.

^(a)

For both transitions;

^(b)

at higher T_ex the line appears in emission;

^(c)

using the IRAM 30m with no dilution;

^(d)

using the NOEMA observations for Ellipse A;

^(e)

using the NOEMA observations for Ellipse B.

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