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Table 2.

Derived abundance ratios for the isomers of HNCO and HNCS in TMC-1.

S-species N(X)/N(HNCS) O-species N(X)/N(HNCO) N(S)/N(O)
HCNS 0.028 ± 0.002 HCNO 0.0071 ± 0.0008 0.12 ± 0.01
HNCS 1.0 HNCO 1.0 0.029 ± 0.004
HSCN 2.60 ± 0.016 HOCN 0.014 ± 0.003 5.52 ± 0.91
HSNC ≤0.013 HONC ≤0.0005
NCS 3.00 ± 0.16 NCO 0.067 ± 0.011 1.28 ± 0.11
NS (a) 5.3 ± 0.7 NO (b) 25 ± 6 0.007 ± 0.002
H2NCO+ 0.0016 ± 0.0005

Notes.

(a)

Column density of (1.7 ± 0.2) × 1012 cm−2 (Cernicharo et al. 2018).

(b)

Column density of (2.7 ± 0.5) × 1014 cm−2 (Gerin et al. 1993).

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