Table 2
Ice column densities and abundances with respect to H2O ice toward IRAS 2A and IRAS 23385.
| Specie | Nice (1017 cm−2) |  (%) |
Literature (% H2O) | ||||
|---|---|---|---|---|---|---|---|
| IRAS 2A | IRAS 23385 | IRAS 2A | IRAS 23385 | LYSOs | MYSOs | Comet 67P/C-G(m) | |
| H2O (★) | 300±12 | 158 ± 36 | 100 | 100 | 100 | 100 | 100 |
| CH4 (★) |  |
 |
1.6 | 3.3 | <3 (a) | 1–11 (b) | 0.340 ± 0.07 |
| SO2 (★) |  |
 |
0.2 | 0.1 | 0.08–0.76(a) | <0.9–1.4 (b) | 0.127 ± 0.100 |
| HCOOH (★) |  |
 |
1.0 | 1.1 | <0.5–4(c) | <0.5–6 (d) | 0.013 ± 0.008 |
| CH3OH (★) | 15, 23(†) | … | 5.0, 7.6 | … | <1-25(d) | <3-31 (d) | 0.21 ± 0.06 |
| CH3CHO (★) |  |
 |
0.7 | 0.4 | … | <2.3 (e) | 0.047 ± 0.017 |
| CH3CH2OH (★) |  |
 |
1.2 | 1.8 | … | <1.9 (e) | 0.039 ± 0.023 |
| CH3OCHO (★) |  |
 |
0.1 | 0.7 | <2.3 (f) | … | 0.0034± 0.002 |
| CH3COOH (‡) |  |
0.0 | 0.3 | 0 | … | … | 0.0034± 0.002 |
| HCOO− (★) (7.4 µm) |  |
 |
0.4 | 0.2 | ~0.4 (g) | <0.3–2.3 (b) | … |
| OCN− (★) |  |
 |
1.2 | 0.6 | <0.1–1.1 (h) | 0.04–1.7 (i) | … |
| H2CO (‡) |  |
… | 4.1 | … | ~6(g) | ~2–7 (b) | 0.32 ± 0.1 |
| Upper limits | |||||||
| CH3NH2 | <4.1 | … | <1.4 | … | <16 (j) | <3.4 (j) | … |
| CH3OCH3 | <2.5 | … | <0.8 | … | … | … | 0.039 ± 0.023 |
| CH3COCH3 | <1.1 | … | <0.4 | … | … | … | 0.0047 ± 0.0024 |
| HCOCH2OH | <0.9 | … | <0.3 | … | … | … | 0.0034± 0.002 |
| CH3CN | <5.0 | … | <1.6 | … | <4.1 (k) | <3.4 (k) | 0.0059 ± 0.0034 |
| NH2CHO | <1.3 | … | <0.4 | … | <3.7 (l) | <2.1 (l) | 0.0040 ± 0.0023 |
| Glycine | <0.1–0.6 | … | <0.03–0.2 | … | … | ~0.3 (b) | … |
Notes. These values are compared to literature values for other objects. (†)The CH3OH ice column density is considered a factor of 2 and 3 higher than the Gaussian fit shown in Fig. K.2 because of the band saturation. (★)Chemical species with secure detection. (‡)Tentative detections. CH3COOH depends on the local continuum choice. H2CO is based on a single band of this molecule mixed in the ice with other CO, CH3OH and CH3OCHO.
References. (a)Öberg et al. (2008), (b)Gibb et al. (2004), (c)Öberg et al. (2011), (d)Schutte et al. (1999), (e)Terwisscha van Scheltinga et al. (2018), (f)Terwisscha van Scheltinga et al. (2021), (g)Boogert et al. (2008), (h)van Broekhuizen et al. (2005), (i)Boogert et al. (2022),(j)Rachid et al. (2021), (k)Rachid et al. (2022),(l)Slavicinska et al. (2023), (m)Rubin et al. (2019).
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