Table 10
Column density ratios in different sources.
| Column density | Sgr B2 (N2)(a) | Sgr B2(b) | Orion KL(c) | Orion KL(c) | Orion KL(c) | Orion KL(d) | IRAS16293A(e) | IRAS16293B(e) | TMC-1 | L1544 | L483(f) | Horsehead |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ratio | EtCN3 | EtCN1 | EtCN2 | (IRAM 30 m) | PDR | |||||||
| CH3NC/CH3CN | 4.7 × 10−3 | 0.02 | 3 × 10−3⋆ | <1.4 × 10−3 | 6 × 10−4⋆ | 2(1) × 10−3⋆ | <1.8 × 10−4 | 5 × 10−3 | <0.09(g) | – | 0.09 | 0.15(2)(h) |
| C2H5NC/C2H5CN | <2.4 × 10−4 | – | <2.5 × 10−3 | <7 × 10−3 | <7 × 10−3 | <3(2) × 10−3 | – | – | – | – | – | – |
| C2H3NC/C2H3CN | <7.1 × 10−3 | – | <0.025 | <0.02 | <0.05 | <0.10(5) | – | – | – | – | – | – |
| HCCNC/HC3N | 1.5 × 10−3 | – | – | – | – | <8(4) × 10−4 | – | – | 0.018(2)(h),(k) | 0.05–0.09(l),(m) | 0.014 | <0.1(n) |
| HNC3/HC3N | <1.9 × 10−4 | – | – | – | – | <8(4) × 10−4 | – | – | 2.4(4) × 10−3(i),(j) | 5 − 8 × 10−3(k),(l) | 1.2 × 10−3 | – |
| HC3NH+/HC3N | <1.7 × 10−3 | – | – | – | – | – | – | – | 6(1) × 10−3(m),(j) | 8.4(42) × 10−3(l) | 5.5 × 10−3 | – |
Notes. Numbers in parentheses represent uncertainties in unit of the last digit. Asterisks mark detections reported in the literature that we consider as only tentative after inspection of the published spectra and fits.
References. (a) This work; (b) Remijan et al. (2005); (c) Margulès et al. (2018); (d)López et al. (2014); (e)Calcutt et al. (2018); (f)Agúndez et al. (2019); (g)Irvine & Schloerb (1984); (h)Gratier et al. (2013). (i)Kawaguchi et al. (1992a); (j)Takano et al. (1998); (k)Vastel et al. (2018); (l)Quénard et al. (2017); (m)Kawaguchi et al. (1992b); (n)Kawaguchi et al. (1994);
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