Table 4
Estimated HCN and DCN column densities towards the source centre.
| Offseta | Transition | Velocity | T mb | FWHM | T ex | τ | N | N(HCN)b |
|
|
( ) |
(km s-1) | (K) | (km s-1) | (K) | (1012 cm-2) | (1015 cm-2) | (× 103) | |||
|
|
||||||||||
| 15.0, 7.5 | HC15N J = 4–3 | 8.8 | 0.4 | 18.1 | 16.3 | 0.04 | 7.8 | 3.5 | 4.8 | |
| 15.0, 15.0 | HC15N J = 4–3 | 10.7 | 0.4 | 14.7 | 16.3 | 0.04 | 7.3 | 3.3 | 5.8 | |
| 7.5, 0.0 | HC15N J = 4–3 | 8.3 | 0.9 | 14.6 | 16.4 | 0.09 | 16.0 | 7.2 | 10. | |
| 7.5, 7.5 | HC15N J = 4–3 | 7.1 | 0.8 | 14.1 | 16.4 | 0.08 | 13.6 | 6.1 | 8.4 | |
| 7.5, 15.0 | H13CN J = 4–3 | 7.1 | 1.6 | 15.6 | 16.5 | 0.17 | 31.8 | 2.4 | 4.1 | |
| 0.0, 0.0 | HC15N J = 4–3 | 10.4 | 1.1 | 11.7 | 16.4 | 0.11 | 15.1 | 6.8 | 6.2 | |
| 0.0, 7.5 | HC15N J = 4–3 | 9.1 | 0.9 | 12.2 | 16.4 | 0.09 | 13.0 | 5.9 | 5.4 | |
| 0.0, 15.0 | H13CN J = 4–3 | 6.5 | 1.7 | 13.7 | 16.5 | 0.18 | 28.7 | 2.2 | 3.6 | |
| –7.5, 0.0 | H13CN J = 4–3 | 9.3 | 2.0 | 15.0 | 16.6 | 0.22 | 38.4 | 3.0 | 3.1 | |
| –7.5, 7.5 | H13CN J = 4–3 | 8.1 | 2.0 | 15.1 | 16.6 | 0.21 | 37.8 | 2.9 | 4.2 | |
|
|
||||||||||
| 15.0, 7.5 | DCN J = 5–4 | 5.0 | 0.1 | 14.0 | 18.3 | 0.01 | 4.5 | 1.3 | ||
| 15.0, 15.0 | DCN J = 5–4 | 10.1 | 0.2 | 14.2 | 18.3 | 0.02 | 9.1 | 2.8 | ||
| 7.5, 0.0 | DCN J = 5–4 | 4.2 | 0.2 | 7.8 | 18.3 | 0.02 | 3.2 | 0.4 | ||
| 7.5, 7.5 | DCN J = 5–4 | 5.2 | 0.3 | 9.5 | 18.3 | 0.03 | 8.3 | 1.4 | ||
| 7.5, 15.0 | DCN J = 5–4 | 6.8 | 0.3 | 14.5 | 18.3 | 0.03 | 10.0 | 4.1 | ||
| 0.0, 0.0 | DCN J = 5–4 | 9.3 | 0.2 | 14.4 | 18.3 | 0.02 | 7.9 | 1.2 | ||
| 0.0, 7.5 | DCN J = 5–4 | 7.2 | 0.3 | 13.1 | 18.3 | 0.03 | 10.8 | 1.9 | ||
| 0.0, 15.0 | DCN J = 5–4 | 5.8 | 0.2 | 11.3 | 18.3 | 0.02 | 6.8 | 3.1 | ||
| –7.5, 0.0 | DCN J = 5–4 | 11.5 | 0.3 | 7.5 | 18.3 | 0.03 | 5.2 | 1.8 | ||
| –7.5, 7.5 | DCN J = 5–4 | 9.4 | 0.2 | 10.4 | 18.3 | 0.02 | 5.8 | 2.0 | ||
Notes. DCN and HCN column densities are calculated with RADEX assuming Tkin = 100 K and n(H2) = 2 × 106 cm-3. For the offset positions where HC15N was not detected, the data for H13CN are shown; for the other positions, where both were detected, data for the HC15N J = 4−3 transition are listed and we note that the column density determinations from the H13CN J = 4−3 line agree with these to within ±35%.
based on 12C/13C = 77; 14N/15N = 450 (Wilson & Rood 1994).
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.