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Table I.2
Synthetic fitting of the detected S-bearing species toward NGC 1333-IRAS4B for an excitation temperature of 100 K and a source size of 1″. Directly across from a specific minor isotopolog under “Derived N of isotopologs’ follows the column density of the main isotopolog upon the assumption of the standard isotopic ratio.
| Species | Transition | Frequency (GHz) | Eup (K) | Aij (s−1) | Beam size (″) | FWHM km s−1 | N (cm−2) | Derived N of isotopologs (cm−2) | τ |
|---|---|---|---|---|---|---|---|---|---|
| H2S | 22,0−21,1 | 216.710 | 84 | 4.9×10−5 | 6.5 | 2.0 | >5.8×1015 | – | 0.56 |
| OC33S | 18-17 | 216.147 | 99 | 2.9×10−5 | 6.5 | 1.5 |  |
 |
0.03 |
| OCS, υ = 0 | 19-18 | 231.061 | 111 | 3.6×10−5 | 6.1 | 2.0 | >1.9×1015 | – | 0.20 |
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