Table 4
Upper limit on column densities for undetected isotopologues.
| Species | Column density (cm−2) |
|---|---|
| 13CCH (a) | ≤1.7 × 1012 |
| c-C3D2(a) | ≤1.1 × 1011 |
| l-C3HD (a) | ≤5.6 × 1010 |
| l-C3D2 (a) | ≤4.5 × 1010 |
| CH3CCD (a) | ≤1.4 × 1012 |
| H2C18O (a) | ≤3.4 × 1011 |
| HDCS (a) | ≤2.3 × 1011 |
| D2 CS (a) | ≤3.2 × 1011 |
| C2H3CN(b) | ≤2.8 × 1011 |
| C5H (b) | ≤6.8 × 1011 |
| C6H (b) | ≤2.0 × 1012 |
| HNCCC (b) | ≤8.9 × 1010 |
| HCCNC (b) | ≤3.1 × 1011 |
| HCCCHO (b) | ≤6.0 × 1011 |
| H2 CCN (b) | ≤1.1 × 1011 |
| HCNO (b) | ≤5.0 × 1010 |
| HSCN (b) | ≤1.3 × 1011 |
| NH2CHO (b) | ≤3.8 × 1011 |
Notes. (a)We assumed the same excitation temperature, FWHM and beam dilution than the main isotopologue in our LTE models (see Table 3). (b)We assumed no beam dilution, a FHWM of 1 km s−1, and excitation temperatures of 10, 20, and 30 K. The displayed upper limit is the largest among the three.
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