Table 2
Excitation temperature (Tex), column density (Ntot), and the abundance ratio, N(CH3CN)/N(CH3NC), in IRAS 16293B and IRAS 16293A.
Source | Tex | Ntot | N(CH3CN)c |
---|---|---|---|
(K) | (cm−2) | N(CH3NC) | |
IRAS 16293B | 150 ± 20 | 2.0 ± 0.2 × 1014 | 200 |
IRAS 16293A | 150a | <1.45 × 1013b | >5517 |
Notes. All models assume LTE and a sourcesize of 0.′′5. The FWHM of IRAS 16293B lines is 1 ± 0.2 km s−1 and the peak velocity is 2.7 ± 0.2 km s−1, based on a fit of the data. (a)The excitation for IRAS 16293A is adopted to be the same as IRAS 16293B and similar to other molecules detected towards this source. (b) Determined for the 3σ upper limit assuming an FWHM of 2.2 km s−1, based on the FWHM of other molecules detected in this source in Calcutt et al. (2018). (c) Determined using CH3CN column densities from Calcutt et al. (2018).
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