Table 5.
Parameters of our best-fit LTE model of acetaldehyde, glycolaldehyde, and acetamide, and column density upper limit for glycolamide, toward Sgr B2(N2).
| Molecule | Status (a) | Ndet(b) | Size (c) | Trot(d) | N(e) | Fvib(f) | ΔV(g) | Voff(h) | 
(i) |
|---|---|---|---|---|---|---|---|---|---|
| (″) | (K) | (cm−2) | (km s−1) | (km s−1) | |||||
| Acetaldehyde | |||||||||
| CH3CHO, v = 0⋆ | d | 19 | 1.1 | 160 | 5.3 (17) | 1.08 | 5.6 | 0.0 | 1 |
| vt = 1 | d | 13 | 1.1 | 160 | 5.3 (17) | 1.08 | 5.6 | 0.0 | 1 |
| vt = 2 | d | 2 | 1.1 | 160 | 5.3 (17) | 1.08 | 5.6 | 0.0 | 1 |
| 13CH3CHO, v = 0 | t | 2 | 1.1 | 160 | 2.4 (16) | 1.01 | 5.6 | 0.0 | 22 |
| vt = 1 | n | 0 | 1.1 | 160 | 2.4 (16) | 1.01 | 5.6 | 0.0 | 22 |
| CH3 13CHO, v = 0 | n | 0 | 1.1 | 160 | 2.4 (16) | 1.01 | 5.6 | 0.0 | 22 |
| vt = 1 | n | 0 | 1.1 | 160 | 2.4 (16) | 1.01 | 5.6 | 0.0 | 22 |
| Glycolaldehyde | |||||||||
| CH2(OH)CHO, v = 0⋆ | d | 21 | 1.0 | 170 | 1.1 (17) | 0.92 | 5.4 | 1.0 | 1 |
| v1 = 1 | t | 2 | 1.0 | 170 | 1.1 (17) | 0.92 | 5.4 | 1.0 | 1 |
| v2 = 1 | t | 1 | 1.0 | 170 | 1.1 (17) | 0.92 | 5.4 | 1.0 | 1 |
| 13CH2(OH)CHO, v = 0 | n | 0 | 1.0 | 170 | < 1.6 (16) | 1.37 | 5.4 | 1.0 | > 6.7 |
| CH2(OH)13CHO, v = 0 | n | 0 | 1.0 | 170 | < 2.1 (16) | 1.37 | 5.4 | 1.0 | > 5.4 |
| Acetamide | |||||||||
| CH3C(O)NH2, v = 0⋆ | d | 10 | 0.9 | 180 | 1.4 (17) | 1.23 | 5.0 | 1.5 | 1 |
| vt = 1 | d | 8 | 0.9 | 180 | 1.4 (17) | 1.23 | 5.0 | 1.5 | 1 |
| vt = 2 | d | 5 | 0.9 | 180 | 1.4 (17) | 1.23 | 5.0 | 1.5 | 1 |
| Δvt ≠ 0 | t | 0 | 0.9 | 180 | 1.4 (17) | 1.23 | 5.0 | 1.5 | 1 |
| Glycolamide | |||||||||
| CH2(OH)C(O)NH2, v = 0 | n | 0 | 0.9 | 180 | < 2.4 (16) | 3.38 | 5.0 | 0.0 | – |
Notes. The parameters for acetamide were published in Belloche et al. (2017).
Number of detected lines (conservative estimate, see Sect. 3 of Belloche et al. 2016). One line of a given species may mean a group of transitions of that species that are blended together.
Total column density of the molecule. x (y) means x × 10y. An identical value for all listed vibrational and torsional states of a molecule means that LTE is an adequate description of the vibrational and torsional excitation.
Correction factor that was applied to the column density to account for the contribution of vibrationally excited states, in the cases where this contribution was not included in the partition function of the spectroscopic predictions. For glycolaldehyde, see explanation in Sect. 4.3.
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