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Table 5

Molecular column densities, fractional abundances with respect to H2, CO depletion factors, and the deuteration degrees.

Source N(C17O) N(N2H+) N(N2D+) x(C17O) x(N2H+) x(N2D+) f D N(N2D+)/N(N2H+)
[1014 cm-2] [1013 cm-2] [1012 cm-2] [10-8] [10-9] [10-10]
SMM 6a 1.1 ± 0.2 2.5 ± 0.5a 7.6 ± 0.6 1.5 ± 0.6 2.3 ± 0.9 9.9 ± 3.5 3.6 ± 1.5 0.30 ± 0.07
SMM 6b 2.5 ± 0.3 1.2 ± 0.2 5.2 ± 0.7 3.5 ± 1.4 1.3 ± 0.5 7.2 ± 2.8 1.5 ± 0.6 0.43 ± 0.09
SMM 6c 3.0 ± 0.3 0.7 ± 0.1 2.9 ± 0.2 5.4 ± 2.2 0.9 ± 0.4 4.9 ± 1.9 1.0 ± 0.4 0.41 ± 0.07
SMM 6c (2nd v-comp.) 0.5 ± 0.3 0.3 ± 0.1 ... 0.9 ± 0.6 0.4 ± 0.1 ... 5.9 ± 4.1 ...
SMM 6d 2.7 ± 0.3 0.7 ± 0.1 2.5 ± 0.8 6.4 ± 3.1 1.1 ± 0.5 5.5 ± 3.0 0.8 ± 0.4 0.36 ± 0.13

Notes.The N(C17O) values were computed by assuming that Tex = 10 K. The N2H+ and N2D+ column densities were derived under the assumption that Tex = 5 K.

(a)

The value derived from a group of five optically thin satellites is 1.5 ± 1.2 × 1013 cm-2 (see text).

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