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Table 9
Galactic parameters of the Milky Way.
| Axisymmetric component | |
|
|
|
| Mass of the bulge (Mb) | 1.41 × 1010 M ⊙ |
| Scale length bulge (b1) | 0.3873 kpc |
| Disk mass (Md) | 8.56 × 1010 M ⊙ |
| Scale length disk 1 (a2) | 5.31 kpc |
| Scale length disk 2 (b2) | 0.25 |
| Halo mass (Mh) | 1.07 × 1011 M ⊙ |
| Scale length halo (a3) | 12 kpc |
|
|
|
| Central Bar | |
| Pattern speed (Ωbar) | 40–70 km s-1 kpc-1 |
| Semi-major axis (a) | 3.12 kpc |
| Axis ratio (b/a) | 0.37 |
| Mass (Mbar) | 9.8 × 109–1.1 × 1010M⊙ |
|
|
|
| Spiral arms | |
| Pattern speed (Ωsp) | 15–30 km s-1 kpc-1 |
| Locus beginning (Rsp) | 3.12 kpc |
| Number of spiral arms (m) | 2, 4 |
| Spiral amplitude (Asp) | 650–1100 [ km s-1 ] 2 kpc-1 |
| Pitch angle (i) | 12.8° |
| Scale length (RΣ) | 2.5 kpc |
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