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Table 4

Molecular column densities, fractional abundances with respect to H2, and CO depletion factors (fD).

Source N(C17O) x(C17O) fD N(CH3OH) x(CH3OH)
[1014 cm-2] [10-8] [1013 cm-2] [10-9]
SMM 1 4.7 ± 1.3 3.1 ± 1.7 2.2 ± 1.2 2.1 ± 0.3–4.4 ± 0.7 1.3 ± 0.8–2.7 ± 1.6
SMM 2 3.4 ± 1.0 4.1 ± 2.3 1.7 ± 0.9 1.6 ± 0.3–3.4 ± 0.7 0.2 ± 0.1–0.4 ± 0.1
SMM 3a 4.9 ± 1.4 3.0 ± 1.7 2.3 ± 1.3 9.9 ± 1.3–20.7 ± 2.7 5.8 ± 3.3–12.2 ± 6.9
SMM 4 15.1 ± 3.9 6.3 ± 3.4 1.1 ± 0.6 3.2 ± 0.4–6.7 ± 0.9 1.3 ± 0.7–2.8 ± 1.5
IRAS 13037-6112 21.8 ± 2.2 21.9 ± 12.1 0.3 ± 0.2 3.8 ± 0.4–7.9 ± 0.9 3.8 ± 2.3–7.9 ± 4.4
SMM 5 7.6 ± 2.0 13.0 ± 7.2 0.5 ± 0.3 ... ...
SMM 6 19.7 ± 5.1 12.2 ± 6.7 0.6 ± 0.3 ... ...
SMM 7 13.3 ± 3.5 16.5 ± 9.1 0.4 ± 0.2 ... ...
IRAS 13039-6108 10.5 ± 1.1 12.0 ± 6.7 0.6 ± 0.3 ... ...
SMM 8 6.9 ± 1.9 6.8 ± 3.7 1.0 ± 0.5 ... ...
SMM 9 6.6 ± 1.9 5.9 ± 3.2 1.2 ± 0.6 ... ...
IRAS 13042-6105 3.5 ± 1.0 5.1 ± 2.8 1.3 ± 0.7 ... ...

Notes. 

(a)

Towards SMM 3, we also determined the SiO and DCN column densities and abundances of N(SiO) = 6.5 ± 1.2 × 1011−2.5 ± 0.5 × 1013 cm-2, x(SiO) = 4.0 ± 2.4 × 10-11−1.5 ± 0.9 × 10-9, and N(DCN) = 6.7 ± 1.8−48.7 ± 12.8 × 1010 cm-2, x(DCN) = 4.1 ± 2.5−30.1 ± 18.3 × 10-12.

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