Table 7
Fitting results for the distribution of observed centroid velocities.
| Line | H13CO+(1–0) | C18O(1–0) |
|---|---|---|
| Transverse velocity gradient | (V(r) = Vsys + r∇Vr) | |
| Vsys | 11.23±0.01 km s−1 | 10.98±0.01 km s−1 |
| ∇Vr | 2.72±0.15 km s−1 pc−1 | 0.65±0.19 km s−1 pc−1 |
| Longitudinal velocity gradient | (V(z) = Vsys + z∇Vz + V0 cos(2πz/λ + θshift)) | |
| Vsys | 11.03±0.14 km s−1 | 10.64±0.05 km s−1 |
| ∇Vz | 0.29±0.17 km s−1 pc−1 | 0.51±0.06 km s−1 pc−1 |
| V0 | 0.15±0.08 km s−1 | 0.10±0.02 km s−1 |
| λ | 0.21±0.01 pc | 0.26±0.01 pc |
| θoffset | 0.55±1.46 rad | 4.90±0.64 rad |
Notes. The fitting was performed on independent centroid velocity measurements (i.e., separated by more than a beam size). Quoted errors are formal statistical errors corresponding to the square roots of the diagonal elements in the covariance matrix of fitted parameters returned by the scipy curve_fit routine. Total errors may be larger.
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