Table 1.
Column density Ntot expressed in cm−2 of formamide and formaldehyde in several interstellar objects and the Halle Bopp comet.
| Object | H2 | HCONH2 | HCHO | HCHO/HCONH2 | Ref. |
|---|---|---|---|---|---|
| (cm−2) | Ntot (cm−2) | Ntot (cm−2) | ratio | ||
| Orion KL Compact Ridge | 1.00 × 1024 | 4.70 × 1013 | 4.10 × 1016 | 872 | a,b |
| NGC 7538 Bubble Nebula | 1.00 × 1023 | 4.80 × 1012 | 2.00 × 1014 | 42 | a,c |
| G34.3 Nebula | 5.00 × 1023 | 1.20 × 1013 | 1.30 × 1014 | 11 | a,d |
| W3(OH) Emission Nebula | 1.00 × 1023 | 3.30 × 1012 | 1.66 × 1014 | 50 | a,e |
| DR21(OH) Cloud | 1.00 × 1023 | 1.10 × 1012 | 4.00 × 1014 | 364 | a,f |
| SgrB2 N Cloud Core | 3.00 × 1024 | 1.70 × 1014 | 1.60 × 1015 | 9 | a,g |
| W33A Protostar | 2.00 × 1023 | 1.00 × 1013 | 4.00 × 1017 | 40 000 | a,h |
| Hale Bopp Comet | 1.00 × 1019 | 2.00 × 1015 | 1.10 × 1017 | 55 | a,i |
References. a: Adande et al. (2013), b: Mangum et al. (1990), c: Downes & Wilson (1974), d: Thompson et al. (1999), e: Cohen (1984), f: Forster et al. (1981), g: Halfen et al. (2006), h: Bernstein et al. (1995), i: Bockelee-Morvan et al. (2000).
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