Table 1.
Properties of the three spiral-arm structures with different pattern speeds for the considered models.
| Models | MMS, 1(γ1) |
MMS, 2(γ2) |
MMS, 3(γ3) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ωs, 1 | R1, min | R1, max | R1, cor. | Ωs, 2 | R2, min | R2, max | R2, cor. | Ωs, 3 | R3, min | R3, max | R3, cor. | |
| [km s−1 kpc−1] | [kpc] | [kpc] | [kpc] | [km s−1 kpc−1] | [kpc] | [kpc] | [kpc] | [km s−1 kpc−1] | [kpc] | [kpc] | [kpc] | |
| A | 30.0 | 3.0 | 7.0 | 6.0 | 20.0 | 6.0 | 12.0 | 8.7 | 15.0 | 9.0 | 18.0 | 12.0 |
| A1 | 30.0 | 3.0 | 7.0 | 6.0 | / | / | / | / | / | / | / | / |
| A2 | / | / | / | / | 20.0 | 6.0 | 12.0 | 8.7 | / | / | / | / |
| A3 | / | / | / | / | / | / | / | / | 15.0 | 9.0 | 18.0 | 12.0 |
| B1 | 30.0 | 3.0 | 7.0 | 6.0 | 20.0 | 6.0 | 12.0 | 8.7 | 17.0 | 9.0 | 18.0 | 10.2 |
| B2 | 30.0 | 3.0 | 7.0 | 6.0 | 20.0 | 6.0 | 12.0 | 8.7 | 13.0 | 9.0 | 18.0 | 13.3 |
| A+C1 | Ωd | 3.0 | 7.0 | [3–7] | Ωd | 6.0 | 12.0 | [6–12] | Ωd | 9.0 | 18.0 | [9–18] |
| (last 0.1 Gyr) | ||||||||||||
| A+C2 | Ωd | 3.0 | 7.0 | [3–7] | Ωd | 6.0 | 12.0 | [6–12] | Ωd | 9.0 | 18.0 | [9–18] |
| (last 0.3 Gyr) | ||||||||||||
| A+C3 | Ωd | 3.0 | 7.0 | [3–7] | Ωd | 6.0 | 12.0 | [6–12] | Ωd | 9.0 | 18.0 | [9–18] |
| (last 1 Gyr) | ||||||||||||
Notes. We show pattern speed (Ωs, j) limits of the Galactic spanned region (Rmin and Rmax values) and the co-rotation radius Rj, cor. for each modulation function MMS, j(γj) as defined in Eq. (11). All the listed models are also characterised by: the radial scale length of the drop-off in density amplitude of the arms RS = 7 kpc, disc scale-length RD = 3.5 kpc, surface arm density at R0 = 8 kpc, which is ΣS, 0 = 20 M⊙ pc−2, star formation efficiency ν = 1.1 Gyr−1, and multiplicity m = 2.
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