Table 7
Column densities of the isocyanide species and N(-CN)/N(-NC) ratios.
| Molecule | NTOTAL (cm-2) | [N(-NC)/N(-CN)] | Isomerization energy | ||
|
|
|||||
| Orion-KL | Sgr B2 | TMC-1 | (cm-1) | ||
| CH2CHCN | (4 ± 1) ×1015 | ||||
| CH2CHNC | ≤(4 ± 2) ×1014 | ≤(1.0 ± 0.5) × 10-1 | 5 × 10-3a | 8658a | |
| CH3CN | (3.2 ± 0.9) ×1016 | ||||
| CH3NC | (6.0 ± 3.0) ×1013 | (2 ± 1) × 10-3 | 2 × 10-2a | ≥9 × 10-2c | 9486a |
| (3–5) × 10-2b | |||||
| CH3CH2CN | (7 ± 2) ×1016 | ||||
| CH3CH2NC | ≤(2.0 ± 0.6) × 1014 | ≤(3 ± 2) × 10-3 | ≤3 × 10-1a | 8697a | |
| HCCCN | (4 ± 1) ×1015 | ||||
| HCCNC | ≤(3 ± 1) ×1013 | ≤(8 ± 4) × 10-3 | (2–5) × 10-2d | 6614d | |
| 8 × 10-3e | |||||
| HNCCC | ≤(3 ± 1) ×1013 | ≤(8 ± 4) × 10-3 | (2–6) × 10-3f | 17 745d | |
| 1 × 10-3e | |||||
| NH2CN | ≤(3 ± 1) × 1013 | ||||
| NH2NC | ≤(5 ± 2) × 1013 | ... | ... | ... | 18 537g |
Notes. Derived column densities for the cyanide and isocyanide species (Col. 2). Columns 3–5 show the ratio between the cyanide and its isocyanide isomer in this work and that derived from other authors in Sgr B2 and TMC-1. Column 6 gives the energy difference for the isomerization between the isocyanide species and its corresponding cyanide.
Reference. (2005). . .
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.