Table 2
HCN J = 1 → 0 line features toward NGC 4945 (see also Fig. 2).
| Velocity | Source | Δ α, Δ δ | Comments | |
|---|---|---|---|---|
| (km s−1) | (arcsec) | |||
| ≈350 | 1 | –3 | –7 | Peak 1, becoming detectable at 315 km s−1; strongest feature there |
| 2 | –1 | –1 | Peak 2, at 350 km s−1 strongest feature, slightly SW from the center | |
| 3 | –8 | –4 | Peak 3, weak, southern extension at V > 360 km s−1 | |
| 390 | 1,2,3 | –1 | –1 | Peak 2 emission extends to the SW, Peaks 1 and 3 join the forming NE-SW ridge |
| 420 | 2 | –1 | –1 | Peak 2 dominant, the molecular ridge expands toward the SW |
| 460 | 2 | –1 | –2 | Peak 2 dominant, position angle of ridge changes from ≈40° to ≈60° |
| 4 | –6 | –5 | Appearance of a secondary peak | |
| 480 | 2 | –1 | –2 | Peak 2 (inner SW ridge) gets weaker, appearance of weak extended arms |
| 500 | 2 | –1 | –2 | Peak 2 not dominant, appearance of an extended arm in the NW |
| 515 | –1 | –2 | Absorption, surrounded by emission in the SE, NW, and SW | |
| 5 | +6 | –8 | Weak extended arms in the NW; given offset marks a hotspot in the SE | |
| 530–570 | The morphology of the core emission resembles a Ψ at position angle ≈40° | |||
| 575 | 6 | –2 | –3 | Absorption SW of the dynamical center, appearance of an extended arm in the SE |
| 600 | 6 | –2 | –3 | Absorption SW of the dynamical center, widespread weak line emission |
| 7 | +2 | +2 | A second region exhibiting absorption, located in the NE | |
| 8 | –1 | +2 | Prominent (at this velocity) but not a particularly strong emission peak | |
| 5 | +6 | +8 | Prominent (at this velocity) but not a particularly strong emission peak | |
| 620–665 | 9 | 0 | 0 | Absorption dominates, morphology similar to that of the continuum emission (see Fig. 1) |
| Widespread weak line emission, strongest on the NW side of the absorbing region, | ||||
| from there extensions to the NE; also extended emission SE of the center | ||||
| 5 | +6 | +8 | The SE hotspot (see 515 km s−1) fades | |
| 650–675 | Absorption fades | |||
| 665 | 10 | +1 | 0 | Appearance of an emission component slightly NE of the center |
| 665–700 | 10 | +1 | 0 | While the position of the line peak is kept, the emission spreads toward the NE |
| 710 | 11 | +3 | +2 | At this position emission becomes most intense, at higher velocities |
| line intensities start to decrease, disappearance of the extended arms | ||||
| in the NW and SE | ||||
| 745 | 0 | 0 | SW edge of the ridge of line emission | |
| 12 | +4 | +3 | NE edge of the ridge of line emission | |
| 770 | 9 | 0 | 0 | Weak line emission peak |
| 13 | +5 | +9 | Weak line emission peak | |
Notes. The table presents the positions of the main HCN J = 1 → 0 hotspots. The numbers of the molecular hotspots given in Col. 2 can be visualized in Fig. 2 (white crosses). In the table they follow, from top to bottom, the barycentric velocity axis of the data cube. Therefore the table is best read from top to bottom. Position offsets given in Cols. 3 and 4 are relative to our λ ≈ 3 mm continuum peak at α2000 = 13h 05m27.s5, δ2000 = –49°28′05″ (Sect. 3.1). The value 1″ corresponds to ≈19 pc (Sect. 1).
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