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Table 7

Column densities and fractional abundances of the other candidate species observed.

Source Molecule Ntot [cm-2] x ≡ Ntot/N(H2)
IRDC 18102-1800 MM1 o-c-C3H2 1.7 ± 0.8 × 1013 1.8 ± 0.8 × 10-9
CH3NH2a 5.0 × 1014b 5.1 ± 0.6 × 10-8
OCSa 2.3 ± 0.8 × 1015 2.4 ± 0.9 × 10-7
13CS 6.0 ± 2.9 × 1013 6.2 ± 3.1 × 10-9
SiO 1.2 ± 0.8 × 1015 1.1 ± 0.8 × 10-7
IRDC 18151-1208 MM2 o-c-C3H2 7.0 ± 1.7 × 1012 1.9 ± 0.5 × 10-10
C2Dc 1.5 × 1013d 4.2 ± 0.5 × 10-10
CH2CHC15N 2.5 × 1016b 6.9 ± 0.9 × 10-7
SiO 1.1 ± 0.3 × 1015 2.5 ± 0.8 × 10-8
IRDC 18182-1433 MM2 o-c-C3H2 7.7 ± 0.8 × 1013 1.2 ± 0.2 × 10-8
CH3COCH3 2.0 × 1015b 4.1 ± 0.6 × 10-7
IRDC 18223-1243 MM3 o-c-C3H2 2.2 ± 0.3 × 1013 1.6 ± 0.3 × 10-9
SiO 4.0 ± 0.6 × 1014 2.9 ± 0.5 × 10-8

Notes. 

(a)

The corresponding line is blended with OCS.

(b)

Calculated by assuming that Tex = 2/3 × Eu/kB.

(c)

The other C2D hf group detected is possibly blended with CH2CHC15N.

(d)

Calculated by assuming that Tex = Eu/kB.

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