Table 4
Upper limits for the molecular column density and abundances with respect to H2 of different conformers of cysteamine derived toward the G+0.693–0.027 molecular cloud.
| Conformer | N (×1013 cm–2) (a) | Abundance (b) (×10–10) | Transition (c) | Frequency (GHz) | (c) Eup (K) | Elo (K) | NNH2CH2CH2OH/N |
|---|---|---|---|---|---|---|---|
| gGt | <1.7 | <1.3 |  |
94.124644 | 14.5 | 10.0 | >0.8 |
 |
94.124663 | 14.5 | 10.0 | ||||
 |
94.124716 | 14.5 | 10.0 | ||||
| gGg | <0.5 | <0.4 |  |
87.184483 | 9.8 | 5.6 | >3.1 |
 |
87.184540 | 9.8 | 5.6 | ||||
 |
87.184583 | 9.8 | 5.6 | ||||
 |
87.184920 | 9.8 | 5.6 | ||||
 |
87.184979 | 9.8 | 5.6 | ||||
 |
87.185022 | 9.8 | 5.6 | ||||
| g'Gg | <1.6 | <1.2 |  |
35.918699 | 6.5 | 4.7 | >0.9 |
| g'Gg' | <0.3 | <0.2 |  |
45.008702 | 9.1 | 6.9 | >5.3 |
 |
45.008734 | 9.1 | 6.9 | ||||
 |
45.008734 | 9.1 | 6.9 | ||||
| g'Gt | <1.4 | <1.1 |  |
92.165413 | 14.4 | 10.0 | >1.0 |
 |
92.165470 | 14.4 | 10.0 | ||||
 |
92.165763 | 14.4 | 10.0 | ||||
Notes. We include the molecular transitions used to compute the upper limits, and the relative molecular ratio of ethanolamine (NH2CH2CH2OH) with respect to each cysteamine conformer. (a)Upper limits derived assuming Tex = 9.7 K, FWHM = 15 km s–1, and vLSR = 68.4 km s–1, obtained from the fit of ethanolamine (NH2CH2CH2OH; Rivilla et al. 2021b). (b)We adopted NH2=1.4 × 1023 cm–2 from Martin et al. (2008). (c)Molecular transitions used to derive the upper limits. The notion used is 
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