Open Access
Table 2.
GRAVITY jets model fit results.
| Parameter | Unit | Jet knot | 2016-07-17 | 2017-07-09 | 2017-07-09 | 2017-07-10 |
|---|---|---|---|---|---|---|
| Epoch 1 | Epoch 2 | Epoch 3 | ||||
| ired | deg | Compact | 84.324 ± 0.006 | 63.67 ± 0.01 | 61.0 ± 0.1 | 62.30 ± 0.01 |
| Extended | 64.88 ± 0.01 | 62.09 ± 0.03 | 61.21 ± 0.02 | |||
| iblue | deg | Compact | 85.201 ± 0.006 | 63.11 ± 0.01 | 59.78 ± 0.01 | 60.64 ± 0.02 |
| Extended | 59.85 ± 0.02 | |||||
| FWHM | km s−1 | All | 1230 ± 13 | 1700 ± 13 | 1661 ± 21 | 1705 ± 20 |
| PA | deg | All | 77.2 ± 1.5 | 87.3 ± 0.6 | 87.1 ± 1.4 | 84.9 ± 1.0 |
| θ | mas | Compact | 3.7 ± 0.5 | 1.2 ± 0.2 | 3.7 ± 0.3 | 0.7 ± 0.1 |
| Extended | 1.9 ± 0.1 | 1.8 ± 0.3 | 19.9 ± 17.4 | |||
| α | mas | Compact | 0.2 ± 0.1 | 1.0 ± 0.3 | 0.7 ± 0.1 | 1.9 ± 0.4 |
| Extended | 3.6 ± 0.2 | 4.8 ± 0.5 | 0.1 ± 0.4 | |||
| r0 | mas | Compact | 0.16 ± 0.02 | 0.5 ± 0.1 | ≲0.5 | ≲0.5 |
| Extended | ≲3 | ≲8 | 3.1 ± 0.1 | |||
| μ(a) | mas | Compact | 1.7 ± 0.4 | 1.7 ± 0.3 | ≈2−4 | 1.5 ± 0.5 |
| Extended | ≈6−8 | ≈6.5−13 | 12 ± 8 | |||
 |
– | – | 1.4 | 2.7 | 1.6 | 1.0 |
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