Table 3.
Averaged 12C/13C ratios and comparison with previous results.
| Source | Range | Average | Previous result | Ref. |
|---|---|---|---|---|
| NGC 253 | 30–67 | 41.6 ± 0.2 | 40 ± 10 | 1, 2, 3 |
| NGC 1068 | 24–62 | 38.3 ± 0.4 | ∼40 (a) | 4 |
| NGC 4945 | 6–44 | 16.9 ± 0.3 | 40–50 | 1, 5, 6 |
Notes.
The 12C/13C ratio is derived from the uncorrected integrated intensity ratio I(12CN)/I(13CN) taken from Nakajima et al. (2018) (see Sect. 2.4). Calibration uncertainties are not considered here but are discussed in Sect. 3.4.
References. (1) Henkel & Mauersberger (1993); (2) Henkel et al. (1993); (3) Henkel et al. (2014); (4) Nakajima et al. (2018); (5) Henkel et al. (1994b); (6) Wang et al. (2004).
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