Table 3
CH3CN/CH3NC ratios in different objects.
| Source | N(CH3CN) | Object type | Ref. |
|---|---|---|---|
| N(CH3NC) | |||
| IRAS 16293A | >5517a | LM | - |
| IRAS 16293B | 200 | LM | - |
| Sgr B2(N) molecular cloud | 50 | HM | [1] |
| Orion KL | 500 | HM | [2] |
| W51 e1/e2 | 96b | HM | [3] |
| NGC 7129 FIRS 2 | 350b | IM | [4] |
| TMC-1 | ≥11 | CC | [5] |
| Horsehead | 7 | PDR | [6] |
Notes. (a) Based on upper limits of CH3NC. (b) CH3NC only tentatively detected. LM stands for low-mass hot core, HM stands for high-mass hot core, IM stands for intermediate-mass, CC stands for cold core, and PDR stands for photon-dominated region.
References. (1) Remijan et al. (2005); (2) López et al. (2014); (3) Kalenskii & Johansson (2010); (4) Fuente et al. (2014); (5) Irvine & Schloerb (1984); (6) Gratier et al. (2013).
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