Table 6
Parameters of our best-fit LTE model of methylamine and methanimine toward Sgr B2(N1S), and upper limits for ethylamine, vinylamine, normal- and iso-propylamine, ethanimine, ketenimine, and propanimine.
| Molecule | Status(a) | Ndet(b) |  |
Trot(d) (K) | N(e) (cm−2) | Fvib(f) | Fconf(g) | ∆V(h) (km s−1) | Voff(i) (km s−1) |  |
|---|---|---|---|---|---|---|---|---|---|---|
| Methylamine | ||||||||||
| CH3NH2(k)(✶) | d | 15 | 2.0 | 230 | 1.4 (18) | 1.25 | – | 5.0 | 0.0 | 1 |
| Ethylamine | ||||||||||
| anti-C2H5NH2 | n | 0 | 2.0 | 230 | <2.5 (17) | 1.74 | 2.43 | 5.0 | 0.0 | >5.4 |
| Vinylamine | ||||||||||
| C2H3NH2 within 0− and 0+ | n | 0 | 2.0 | 230 | <1.7 (17) | 1.27 | – | 5.0 | 0.0 | >8.3 |
| C2H3NH2 between 0− and 0+ | n | 0 | 2.0 | 230 | <1.8 (17) | 1.27 | – | 5.0 | 0.0 | >7.7 |
| n-Propylamine | ||||||||||
| Trans-trans-n-C3H7NH2 | n | 0 | 2.0 | 230 | <1.3 (18) | 3.71 | 5.64 | 5.0 | 0.0 | >1.1 |
| iso-Propylamine | ||||||||||
| trans-i-C3H7NH2 | n | 0 | 2.0 | 230 | <1.4 (18) | 2.55 | 1.78 | 5.0 | 0.0 | >1.0 |
| Methanimine | ||||||||||
| CH2NH(*) | d | 4 | 2.0 | 230 | 9.0 (17) | 1.00 | – | 5.0 | 0.0 | 1 |
| Ethanimine | ||||||||||
| E-CH3CHNH | n | 0 | 2.0 | 230 | <1.6 (17) | 1.55 | – | 5.0 | 0.0 | >5.8 |
| Z-CH3CHNH | n | 0 | 2.0 | 230 | <9.5 (16) | 1.58 | – | 5.0 | 0.0 | >9.5 |
| Ketenimine | ||||||||||
| CH2CNH | n | 0 | 2.0 | 230 | <4.7 (16) | 1.17 | – | 5.0 | 0.0 | >19 |
| Propanimine | ||||||||||
| E-C2H5CHNH | n | 0 | 2.0 | 230 | <1.5 (17) | 3.54 | 1.19 | 5.0 | 0.0 | >6.1 |
| Z-C2H5CHNH | n | 0 | 2.0 | 230 | <2.0 (17) | 3.58 | 6.22 | 5.0 | 0.0 | >4.5 |
Notes. (a)d: detection, n: nondetection. (b)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. (c)Source diameter (FWHM). (d)Rotational temperature. (e)Total column density of the molecule. x (y) means x × 10y. For vinylamine, the two sets of transitions belong to the same species, and each column density corresponds to the total column density of the molecule. For propanimine the two stereoisomers were modeled as independent species, and a isomer correction (Fiso) was applied a posteriori, such that each column density corresponds to the total column density of propanimine. For ethanimine the two isomers were modeled as independent species because of their large barrier to isomerization, and each column density corresponds to the column density of the respective isomer. (f)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. (g)Correction factor that was applied to the column density to account for the contribution of other isomer in the cases where this contribution could be estimated but was not included in the partition function of the spectroscopic predictions. (h)Line width (FWHM). (i)Velocity offset with respect to the assumed systemic velocity of Sgr B2(N1S), Vsys = 62 km s−1. (j)Column density ratio, with Nref the column density of the previous reference species flagged with a star (*). (k)The parameters were derived from the ReMoCA survey by Kisiel et al. (2022).
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