Open Access
Table 2
Parameters of the model.
| Component | Parameter | Value | Units | Fit |
|---|---|---|---|---|
| Local Arm | B | −3.5 ± 0.1 | µG | free |
| b | −2.2 ± 0.8 | deg | Free | |
| n | 1.45 ± 0.03 | Free | ||
| rz | 0.73 ± 0.06 | kpc | Free | |
| rdisc | 1.0 | kpc | ||
| x0 | −0.15 | kpc | ||
| y0 | 0.0 | kpc | ||
| Sagittarius- | B | 1.3 ± 0.2 | µG | Free |
| Carina Arm | b | −80.0 ± 0.9 | deg | Free |
| n | 2.3 ± 0.15 | Free | ||
| rz | 1.0 ± 0.3 | kpc | Free | |
| rdisc | 0.8 | kpc | ||
| x0 | 1.37 | kpc | ||
| y0 | 0.0 | kpc | ||
| Perseus Arm | B | −3.5 ± 0.3 | µG | Free |
| B′ | -−2.0 ± 0.5 | µG | Free | |
| b | 46.0 | deg | ||
| n | 2.0 | |||
| rz | 1.2 ± 0.13 | kpc | Free | |
| rz | 0.4 | kpc | ||
| rdisc | 1.1 | kpc | ||
| x0 | −1.0 | kpc | ||
| y0 | 0.0 | kpc | ||
| Scutum Arm | B | 4.9 ± 0.4 | µG | Free |
| b | −134.0 | deg | ||
| n | 2.0 | |||
| rz | 0.8 | kpc | ||
| rdisc | 1.0 | kpc | ||
| x0 | 1.0 | kpc | ||
| y0 | 0.0 | kpc | ||
| Common pitch | α0 | 20.0 ± 0.2 | deg | Free |
| Northern Torus | B | 3.2 ± 0.4 | µG | Free |
| ɀmin | 1.18 ± 0.07 | kpc | Free | |
| ɀmax | 2.1 ± 0.2 | kpc | Free | |
| rmax | 9.1 ± 0.2 | kpc | Free | |
| Southern Torus | B | −3.2 ± 0.7 | µG | Free |
| ɀmin | −2.5 ± 0.4 | kpc | Free | |
| ɀmax | −1.22 ± 0.11 | kpc | Free | |
| rmax | 14.0 ± 1.6 | kpc | Free | |
| X-field | B | 1.8 ± 0.2 | µG | Free |
| rmax | 6.2 ± 0.2 | kpc | Free | |
| θ | 28.0 ± 3.4 | deg | Free | |
| Local | xLB | −8.2 | kpc | |
| Bubble | yLB | 0.095 ± 0.01 | kpc | Free |
| ɀLB | −0.05 ± 0.015 | kpc | Free | |
| rLB | 0.2 | kpc | ||
| δrLB | 0.03 ± 0.004 | kpc | Free | |
| lLB | 230.0 ± 1.6 | deg | Free | |
| bLB | −2.0 ± 2.0 | deg | Free | |
Notes. See Sect. 3 for the description of each parameter.
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