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Table 2
Constant empirical abundances estimated with RATRAN for the envelope of NGC 1333 IRAS 4A based on HIFI and JCMT observations.
| Molecule | Abundance wrt H2 | Abundance wrt CO | ||
| IRAS 4A | AFGL 2591 | IRAS 4A | AFGL 2591 | |
| (outer) | ||||
|
|
||||
| CO | 3 ×10-5 | 2 ×10-4 | 1 | 1 |
| HCO+ | 1 ×10-9 | 3 ×10-8 | 3.3 ×10-5 | 1.5 ×10-4 |
| N2H+ | 8 ×10-11 | 8 ×10-10 | 2.7 ×10-6 | 4 ×10-6 |
| HCN | 3 ×10-10 | 5 ×10-7 | 1 ×10-4 | 2.5 ×10-3 |
| CS | 3 ×10-9 | 4 ×10-8 | 1 ×10-4 | 2 ×10-4 |
| HNC | 8 ×10-11 | 1 ×10-8 | 2.7 ×10-6 | 5 ×10-5 |
| H2CO | 4 ×10-10 | 1 ×10-8 | 1.3 ×10-5 | 5 ×10-5 |
| CH3OH | 1 ×10-8 | 8 ×10-8 | 3.3 ×10-4 | 4 ×10-4 |
| DCO+ | 1 ×10-11 | ... | 3.3 ×10-7 | ... |
| C2H | 6 ×10-10 | 8 ×10-8 | 3 ×10-5 | 4 ×10-4 |
| CN | 1 ×10-10 | 1 ×10-9 | 3.3 ×10-6 | 5 ×10-6 |
| OCS | 6 ×10-9 | 4 ×10-8 | 2 ×10-4 | 2 ×10-4 |
| SO2 | 4 ×10-10 | 5 ×10-9 | 1.3 ×10-5 | 2.5 ×10-5 |
| HDCO | 5 ×10-11 | ... | 1.7 ×10-6 | ... |
| H2CS | 4 ×10-10 | 4 ×10-9 | 1.3 ×10-5 | 2 ×10-5 |
| D2CO | 5 ×10-11 | ... | 1.7 ×10-6 | ... |
| H2S | 4 ×10-10 | 4 ×10-9 | 1.3 ×10-5 | 2 ×10-5 |
Notes. The table contains also the abundances of AFGL 2591 (outer envelope) for direct comparison.
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