Table 8
Molecular abundances from XCLASS fitting.
| Molecule | Cold core 1 | Cold core 2 | Outflow position | Hot core | |||||
|---|---|---|---|---|---|---|---|---|---|
| (Tex = 49 K(a)) | (Tex = 60 K(a)) | (Tex = 77 K(a)) | |||||||
| N | X | N | X | N | X | Tex | N | X | |
| (cm−2) | (cm−2) | (cm−2) | (K) | (cm−2) | |||||
| •13CO | 2.6 × 1017 | 3.4 × 10−7 | 5.0 × 1017 | 7.3 × 10−7 | 6.1 × 1017 | 1.3 × 10−5 | 162(a) | 8.6 × 1017 | 4.0 × 10−6 |
| •C18O | 5.8 × 1016 | 7.4 × 10−8 | 8.1 × 1016 | 1.2 × 10−7 | 1.1 × 1017 | 2.2 × 10−6 | 162(a) | 1.1 × 1017 | 5.2 × 10−7 |
| •SO | 2.9 × 1014 | 3.7 × 10−10 | 4.2 × 1014 | 6.1 × 10−10 | 4.3 × 1014 | 8.8 × 10−9 | 162(a) | 6.7 × 1015 | 3.1 × 10−8 |
| 33 SO | − | − | − | − | − | − | 162(a) | 5.9 × 1014 | 2.7 × 10−9 |
| •DCN | 8.2 × 1012 | 1.0 × 10−11 | 4.5 × 1012 | 6.7 × 10−12 | 7.7 × 1012 | 1.6 × 10−10 | 162(a) | 3.1 × 1012 | 1.4 × 10−11 |
| OCS | − | − | − | − | − | − | 162(a) | 3.8 × 1015 | 1.8 × 10−8 |
| SO2 | − | − | − | − | − | − | 234 | 5.6 × 1016 | 2.6 × 10−7 |
| 33 SO2 | − | − | − | − | − | − | 234(b) | 7.7 × 1014 | 3.6 × 10−9 |
| 34SO2 | − | − | − | − | − | − | 234(b) | 4.5 × 1015 | 2.1 × 10−8 |
| •H2CO* (c) | 2.3 × 1014 | 2.9 × 10−10 | 3.2 × 1014 | 4.7 × 10−10 | 3.4 × 1014 | 7.0 × 10−9 | 162 | 2.6 × 1015 | 1.2 × 10−8 |
H CO(c) |
− | − | − | − | − | − | 162(a) | 6.6 × 1013 | 3.0 × 10−10 |
| HNCO | − | − | − | − | 3.5 × 1013 | 7.1 × 10−10 | 111 | 1.6 × 1015 | 7.5 × 10−9 |
| •c−C3 H2 | 1.1 × 1013 | 1.4 × 10−11 | 1.8 × 1013 | 2.7 × 10−11 | 4.5 × 1013 | 9.2 × 10−10 | 162(a) | 5.7 × 1013 | 2.6 × 10−10 |
| H2 CCO | − | − | − | − | − | − | 162(a) | 1.5 × 1014 | 6.7 × 10−10 |
| t-HCOOH | − | − | − | − | − | − | 162(a) | 2.6 × 1015 | 1.2 × 10−8 |
| •HC3 N | 5.6 × 1013 | 7.1 × 10−11 | 4.8 × 1013 | 7.1 × 10−11 | − | − | 160 | 1.0 × 1014 | 4.6 × 10−10 |
| •E−CH3 OH | 3.4 × 1014 | 4.3 × 10−10 | 4.3 × 1014 | 6.3 × 10−10 | 1.9 × 1014 | 3.8 × 10−9 | 166 | 1.9 × 1016 | 8.7 × 10−8 |
| A−CH3 OH | − | − | − | − | − | − | 108 | 6.7 × 1016 | 3.1 × 10−7 |
| CH3 CN | 1.5 × 1013 | 1.9 × 10−11 | 2.0 × 1013 | 3.0 × 10−11 | 1.5 × 1013 | 3.1 × 10−10 | 166 | 9.8 × 1014 | 4.5 × 10−9 |
| CH3 OCHO | − | − | − | − | − | − | 162(a) | 1.3 × 1015 | 6.0 × 10−9 |
| NH2 CHO | − | − | − | − | − | − | 162(a) | 1.9 × 1014 | 8.7 × 10−10 |
| CH3 COCH3 | − | − | − | − | − | − | 162(a) | 5.2 × 1014 | 2.4 × 10−9 |
| H2 (from continuum)(d) | 7.9 × 1023 | − | 6.8 × 1023 | − | 4.9 × 1022 | − | 162(b) | 2.2 × 1023 | − |
Notes. The spectra are extracted at 02:25:31.970+62:06:23.74 for cold core 1, 02:25:31.505 +62:06:22.41 for cold core 2, 02:25:30.893 +62:06:24.26 for the outflow position and 02:25:31.357 +62:06:20.70 for the hot core W3 IRS4 itself. These are indicated in the continuum panel of Fig. 15. The fit results were obtained using Clark imaging of the widex NOEMA data only, except for those species marked with • where SDI imaging of the combined NOEMA and 30 m widex spectra are used instead. (a) Tex taken from H2CO for the same position. (b) Tex taken from SO2 for the same position. (c)Calculated assuming an ortho-to-para ratio of 1.6, consistent with cold formation (see Sect. 4.3 for more details). (d) Calculated using the Eq. (3) and NOEMA continuum data resampled to the same beam as the spectra.
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