Table 4
Results from the modeling of synthetic spectra of the detected S-bearing species toward IRAS 16293 B for source sizes of 1″ and 2″, an excitation temperature of 125 K, and a line width of 1 km s−1.
| Species | Transition | Freq. (GHz) | Eup (K) | Aij (s−1) | Beam size (″) | N (cm−2) | Derived N of isotopologs (cm−2) | τ | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | |||
| 1″ | 2″ | 1″ | 2″ | 1″ | 2″ | ||||||
| H2S | 22,0 −21,1 | 216.710 | 84 | 4.9×10−5 | 6.0 | op.thick | op. thick |  |
 |
30.0 | 8.00 |
| H2 33S | 22,0,1 −21,1,2 | 215.494 | 84 | 2.4×10−5 | 6.0 |  |
 |
 |
 |
0.02 | 0.004 |
| 22,0,1 − 21,1,1 | 215.497 | 84 | 2.4×10−5 | 0.02 | 0.004 | ||||||
| 22,0,4 − 21,1,3 | 215.501 | 84 | 6.9×10−6 | 0.02 | 0.005 | ||||||
| 22,0,4 − 21,1,4 | 215.503 | 84 | 4.2×10−5 | 0.10 | 0.030 | ||||||
| 22,0,2 − 21,1,3 | 215.504 | 84 | 1.7×10−5 | 0.02 | 0.010 | ||||||
| 22,0,2 − 21,1,2 | 215.505 | 84 | 1.9×10−5 | 0.03 | 0.010 | ||||||
| 22,0,2 − 21,1,1 | 215.508 | 84 | 1.2×10−5 | 0.02 | 0.004 | ||||||
| 22,0,3 − 21,1,3 | 215.512 | 84 | 2.8×10−5 | 0.06 | 0.020 | ||||||
| 22,0,3 − 21,1,2 | 215.513 | 84 | 1.1×10−5 | 0.02 | 0.010 | ||||||
| 22,0,3 − 21,1,4 | 215.513 | 84 | 9.1×10−6 | 0.02 | 0.005 | ||||||
| H2 34S | 22,0 − 21,1 | 214.377 | 84 | 4.7×10−5 | 6.0 | op.thick | >1.5×1015 | 1.00 | 0.20 | ||
| OCS, υ = 0 | 19−18 | 231.061 | 111 | 3.6×10−5 | 5.6 | op. thick | op. thick |  |
 |
46.0 | 11.0 |
| OC33S | 18−17 | 216.147 | 99 | 2.9×10−5 | 6.0 | >2.4×1015 | >5.6×1014 | 0.40 | 0.10 | ||
| O13CS | 19−18 | 230.318 | 110 | 3.5×10−5 | 5.7 | >3.8×1015 | >8.2×1014 | 0.60 | 0.10 | ||
| 18OCS | 19−18 | 216.753 | 104 | 3.0×10−5 | 6.0 |  |
 |
 |
 |
0.07 | 0.02 |
| OCS, υ2 = 1− | 19−18 | 231.342 | 860 | 3.5×10−5 | 5.6 |  |
 |
0.03 | 0.01 | ||
| OCS, υ2 = 1+ | 19 18 | 231.584 | 860 | 3.5×10−5 | 5.6 | 0.03 | 0.01 | ||||
Notes. Columns in the table of line parameters denote the following: (1) detected S-bearing species, (2) transition of the emission line, (3) frequency of the emission line, (4) upper energy level, (5) Einstein A coefficient, (6) beam size, (7) column density, (8) derived column density of the main isotopologs, and (9) optical depth of the emission line. Directly across from a specific minor isotopolog under “Derived N of isotopologs” comes the column density of the main isotopolog upon the assumption of the standard isotopic ratio. In bold, in the same column, we have the average column density of the main isotopolog based on all the available minor isotopologs (only if the minor isotopolog is optically thin and including the uncertainties). The isotopic ratios assumed to derive column densities of the main isotopologs from their minor isotopologs: (a)32S/33S = 125 (Asplund et al. 2009), (b)16O/18O = 557 (Wilson 1999). Other isotopic ratios considered in the analysis of the data are 12C/13C = 69 (Wilson 1999) and 32S/34S = 22 (Wilson 1999).
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