Table 3
Steady-state abundances of selected species and their isotopologues (see also Fig. 1).
| Species | [X]a | Species | [X]a | ℛb | ℛnc | δ 15 d |
|
|
||||||
| N | 1.7(–05) | 15N | 2.7(–08) | 631 | 1.4 | –569 |
| N2 | 2.3(–05) | 15NN | 1.2(–07) | 396 | 0.9 | –313 |
| NO | 2.9(–07) | 15NO | 4.7(–10) | 627 | 1.4 | –566 |
| CN | 6.1(–10) | C15N | 1.1(–12) | 545 | 1.2 | –501 |
| HCN | 4.8(–09) | HC15N | 1.8(–11) | 269 | 0.6 | 11 |
| NH | 4.7(–09) | 15NH | 1.4(–11) | 326 | 0.7 | –166 |
| NH2 | 6.1(–09) | 15NH2 | 1.4(–11) | 427 | 1.0 | –363 |
| NH3 | 1.9(–08) | 15NH3 | 4.4(–11) | 426 | 1.0 | –362 |
| N2H+ | 8.6(–10) | 15NNH+ | 2.5(–12) | 345 | 0.8 | –212 |
| N15NH+ | 3.0(–12) | 292 | 0.7 | –69 | ||
| N+ | 7.6(–11) |
|
1.5(–13) | 504 | 1.1 | –460 |
| C2N+ | 8.8(–13) |
|
3.3(–15) | 271 | 0.6 | 4 |
| H2CN+ | 9.6(–12) | H2C15N+ | 3.8(–14) | 255 | 0.6 | 67 |
| NH+ | 4.4(–16) | 15NH+ | 8.9(–19) | 497 | 1.1 | –453 |
|
2.2(–15) |
|
4.8(–18) | 470 | 1.1 | –421 |
|
4.5(–13) |
|
1.0(–15) | 439 | 1.0 | –381 |
|
6.9(–12) |
|
1.6(–14) | 426 | 1.0 | –362 |
Notes.
Abundance ratio of the two isotopologues: n(XN)/n(X15N). For species containing two nitrogen atoms, the ratio has been multiplied by two to emphasize that a ratio of 220 indeed means no fractionation for such species.
Fractionation level, or normalized isotopic ratio, is the isotopic ratio normalized to the protosolar value 14N/15N = 440 from Marty et al. (2011).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.