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Table 3

Best values of fitted parameters obtained by the mean of the last third of eight independent chains and standard deviation assuming Caldwell & Ostriker (1981) and Sofue (2015) rotation curves.

Parameter Caldwell Sofue

Solar motion
U 12.75 ± 1.26 11.88 ± 1.38
V 0.93 ± 0.30 0.91 ± 0.26
W 7.10 ± 0.16 7.07 ± 0.16
Vertex deviation
V D a − 0.0439 ± 0.0375 − 0.0618 ± 0.0218
V D b − 0.0144 ± 0.0122 − 0.0048 ± 0.0108

Thin disk
A 5.69 ± 0.37 5.69 ± 0.41
B 2.48 ± 0.30 2.33 ± 0.28
C − 0.0966 ± 0.0404 − 0.0774 ± 0.0362
σ V / σ U 0.57 ± 0.03 0.58 ± 0.03
σ W / σ U 0.46 ± 0.03 0.46 ± 0.02
h σ U 13 176. ± 6908. 9534. ± 3982.
h σ W 15 919. ± 8609. 10 414. ± 6299.

Thick disk
σ U 40.02 ± 1.74 41.58 ± 1.51
σ V 31.86 ± 1.55 30.95 ± 1.50
σ W 27.89 ± 1.26 27.02 ± 1.00

Old thick disk
σ U 75.64 ± 8.58 79.64 ± 7.96
σ V 55.41 ± 8.74 57.55 ± 8.51
σ W 66.43 ± 3.95 62.15 ± 6.62

Lr − 5384. ± 38. − 5378. ± 155.
BIC 10 861. ± 76. 10 851. ± 161.

Notes. Units are km s-1 for velocities, pc for the scale lengths, and radians for the vertex deviation, which is given for stars younger than 1 Gyr (VDa) and older than 1 Gyr (VDb). A, B, and C are the coefficients of the polynomial describing the variation of σW with age in Gyr (Eq. (1)). The BIC is computed from Eq. (4).

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