Table 4.
Results for PM and the corresponding transverse velocity of the M33 COM derived from 5p solution sample, blue 6p solution sample and red 6p solution sample with GBP − GRP ≤ 2.6.
| Sample (#) |
 (μas yr−1) |
μδ (μas yr−1) | μ (μas yr−1) | Vα* (km s−1) | Vδ (km s−1) | Vtrans (km s−1) |
|---|---|---|---|---|---|---|
| Heliocentric frame | ||||||
| 5p (334) | 45.3 ± 9.7 | 26.3 ± 7.3 | 52.9 ± 9.1 | 180.2 ± 38.8 | 104.6 ± 29.0 | 210.8 ± 36.3 |
| 6p Blue (502) | 49.9 ± 26.9 | 4.5 ± 22.1 | 55.9 ± 24.1 | 198.7 ± 107.2 | 18.1 ± 87.9 | 222.7 ± 95.9 |
| 6p Red (570) | 25.1 ± 26.9 | 26.0 ± 22.0 | 45.7 ± 20.8 | 100.0 ± 107.1 | 103.5 ± 87.5 | 181.8 ± 82.8 |
| Galactocentric rest frame | ||||||
| 5p (334) | 7.1 ± 9.7 | 57.7 ± 7.3 | 58.9 ± 7.3 | 28.1 ± 38.8 | 229.6 ± 29.0 | 234.5 ± 29.2 |
| 6p Blue (502) | 11.7 ± 26.9 | 35.9 ± 22.1 | 47.2 ± 20.3 | 46.6 ± 107.2 | 143.1 ± 87.9 | 187.8 ± 80.9 |
| 6p Red (570) | −13.1 ± 26.9 | 57.4 ± 22.0 | 65.0 ± 21.4 | −52.1 ± 107.1 | 228.5 ± 87.5 | 258.8 ± 85.3 |
Notes. All results are corrected for zero-point offsets calculated from background QSOs, separately for the 5p and 6p solutions, with the uncertainties calculated as the root-mean-square of the formal MCMC uncertainty and the systematic uncertainty from the zero-point correction. The total PM μ is derived via 10 000 Monte Carlo sampling by propagating the uncertainties in 
and μδ.
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