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Table 9

Molecular column densities and fractional abundances with respect to H2.

Source N(C17O) N(N2H+) N(N2D+)a N(H13CO+) N(HCO+) N(DCO+) N(o − D2CO)a
[1014 cm-2] [1013 cm-2] [1012 cm-2] [1012 cm-2] [1014 cm-2] [1012 cm-2] [1012 cm-2]
IRAS 05399-0121 3.4 ± 0.5 1.5 ± 0.3 3.1 ± 0.3 6.4 ± 1.0 3.8 ± 0.6 7.6 ± 0.9 2.0 ± 0.2
SMM 1 5.6 ± 0.5 1.2 ± 0.3 11.9 ± 1.2 ... ... 13.1 ± 1.0 1.0 ± 0.1
SMM 3 1.3 ± 0.3 0.8 ± 0.2 2.7 ± 0.3 ... ... 2.3 ± 0.3 ...
IRAS 05405-0117 1.3 ± 0.4 2.3 ± 0.3 0.8 ± 0.1 ... ... ... ...
SMM 4 ... ... ... ... ... ... ...
2nd v-comp.b 2.0 ± 0.5 1.0 ± 0.3 9.5 ± 1.0 18.2 ± 7.8 10.9 ± 4.7 10.4 ± 5.0 ...
SMM 5 1.0 ± 0.4 0.4 ± 0.1 ... ... ... ... ...
SMM 6 1.4 ± 0.4 3.0 ± 0.3 17.6 ± 1.8 ... ... 25.9 ± 2.0 ...
Ori B9 N 0.9 ± 0.3 0.1c ... ... ... 1.8 ± 0.3 ...
2nd v-comp.b 2.3 ± 0.5 0.4 ± 0.1 ... ... ... 6.4 ± 2.0 ...
SMM 7 5.2 ± 0.8 0.5 ± 0.1 ... ... ... 10.0 ± 2.0 ...
x(C17O) x(N2H+) x(N2D+) x(H13CO+) x(HCO+) x(DCO+) x(o − D2CO)
[10-8] [10-10] [10-10] [10-10] [10-8] [10-10] [10-11]
IRAS 05399-0121 1.7 ± 0.4 6.5 ± 1.9 1.5 ± 0.3 2.3 ± 0.6 1.4 ± 0.4 3.6 ± 0.9 9.8 ± 2.2
SMM 1 2.9 ± 0.5 5.4 ± 1.6 6.1 ± 1.1 ... ... 5.8 ± 0.9 5.1 ± 0.9
SMM 3 0.5 ± 0.1 3.5 ± 1.0 1.1 ± 0.2 ... ... 1.0 ± 0.2 ...
IRAS 05405-0117 1.5 ± 0.5 23.9 ± 4.0 0.9 ± 0.2 ... ... ... ...
SMM 4 ... ... ... ... ... ... ...
2nd v-comp.b 1.5 ± 0.5 6.2 ± 2.5 6.8 ± 2.0 9.6 ± 4.8 5.8 ± 2.9 6.3 ± 3.5 ...
SMM 5 1.5 ± 0.6 5.5 ± 1.5 ... ... ... ... ...
SMM 6 1.3 ± 0.4 22.3 ± 2.7 15.4 ± 1.9 ... ... 18.7 ± 1.9 ...
Ori B9 N 2.6 ± 1.0 3.3 ± 0.6 ... ... ... 6.3 ± 1.5 ...
2nd v-comp.b 6.7 ± 2.6 13.4 ± 5.4 ... ... ... 22.9 ± 10.2 ...
SMM 7 3.3 ± 1.0 2.8 ± 0.9 ... ... ... 5.5 ± 1.8 ...

Notes. 

(a)

The N2D+ and o-D2CO column densities were derived from Weeds models. For o-D2CO we assumed that Tex = 2/3 × Eu/kB.

(b)

For SMM 4-LVC (~1.6 km s-1) and Ori B9 N-LVC (~1.9 km s-1), Tkin = 10.4 ± 1.4 K and 13.6 ± 2.5 K, respectively (Paper II).

(c)

The associated error derived by varying Tkin and  ⟨ n(H2) ⟩  in the RADEX calculation is negligible.

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