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Table 2

Parameters of the non-axisymmetrical components in today’s MW model (indicated as MW1 in Sect. 4) with their references.

Parameter Value Reference

Galactic bar
Bar mass 0.98 × 1010   M (1)
Bulge mass MC2 0.62 × 109   M
Angular velocity 60.0 km s-1 kpc-1
Major axis half-length 3.14 kpc
Axial ratios 10:3.75:2.56
Bar angle 20°

Spiral arms
Number of spiral arms 2
Pitch angle 15.5° (2)
Amplitude 3.36 × 107   M kpc-3
Angular velocity 20.0 km s-1 kpc-1
Scale-length 2.6 kpc (3)
Scale-height 0.3 kpc (3)
Scale-radius 5.6 kpc (2)

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