Table 6
Molecular abundances relative to CH3OH (N(X)/N(CH3OH)) towards IRS7B and other protostellar sources as established from rotational diagrams. (See also Fig. 10.)
| Molecule | IRS7B | I16293a | L1527b | B1-b corec | L1157 outflowd |
|
|
|||||
| CH3OH | ≡1 | ≡1 | ≡1 | ≡1 | ≡1 |
| H2CO | 0.62 | 0.20 | 0.67 | ... | ... |
| H2CCO | 0.047 | 0.041 | ... | ... | ... |
| HNCO | 0.032 | 0.039 | 0.052 | ... | ... |
| CH3CHO | 0.10 | 0.17 | ... | 0.012 | 0.006 |
| HCOOH | <0.03 | 0.21 | ... | ... | ... |
| CH3CN | 0.006 | 0.033 | ... | ... | ... |
| CH3OCH3 | <0.03 | 0.80 | ... | <0.008 | ... |
| CH3OCHO | <0.16 | 1.3 | <0.08 | 0.023 | 0.018 |
| c-C3H2 | 0.053 | 0.008 | 0.21 | ... | ... |
| CH3CCH | 0.67 | 0.87 | 0.95 | ... | ... |
| CN | 1.1 | 0.023 | > 0.76 e | ... | ... |
| HC3N | ~4 | 0.006 | 0.43 | ... | ... |
| C2H | 1.8 | 0.057 | 15.6 | ... | ... |
Notes.
IRAS 16293-2422 (van Dishoeck et al. 1995; Schöier et al. 2002; Cazaux et al. 2003).
Sakai & Yamamoto (2013) and references therein. Observations were performed with several different single-dish telescopes with beam sizes between 10′′ and 30′′. Since the source is extended (Sakai et al. 2010), we used the beam-averaged column densities.
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