Table 6
Estimated column densities towards the Eastern tail.
| Line | V LSR | T mb | FWHM | rms | T ex | τ | N | |
| (km s-1) | (K) | (km s-1) | (K) | (K) | (1013 cm-2) | |||
|
|
||||||||
| HCN J = 3–2 | –0.1 | 5.05 | 9.7 | 0.52 | 10 | 3.85 | 25.8 | |
| HCN J = 4–3 | –0.3 | 3.55 | 6.7 | 0.04 | 9.5 | 4.01 | 33.0 | |
| H13CN J = 4–3 | –0.8 | 0.20 | 3.4 | 0.08 | 8.5 | 0.07 | 0.7 | |
| DCN J = 5–4a | –1.0 | 0.18 | 1.7 | 0.07 | 12 | 0.04 | 1.2 | |
| HNC J = 4–3 | –0.7 | 2.25 | 3.4 | 0.08 | 8.6 | 1.7 | 9.9 | |
| HCO+J = 4–3 | –0.6 | 5.07 | 5.5 | 0.16 | 13 | 1.4 | 5.0 | |
| H13CO+J = 4–3 | –0.9 | 0.59 | 3.2 | 0.10 | 12 | 0.1 | 0.3 | |
| DCO+J = 5–4 | — | — | — | 0.06 | ≥10. | — | <0.2 | |
Notes. Column densities are calculated with RADEX assuming Tkin = 40 K and n(H2) = 5 × 105 cm-3 towards the Eastern tail at RA = 19:10:16.6; Dec = 09:05:48. We show column density ratios based on both the main lines of HCN and HCO+ and the 13C-substituted lines, since there is some excess emission at higher velocities in the main HCN and HCO+ lines that has not been fitted (see Fig. 12).
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