Open Access
Table 1
Spiral arm parameters for each arm over different azimuth ranges.
| Scutum | Sgr-Car | Orion | Perseus | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Strength | Prominence | Strength | Prominence | Strength | Prominence | Strength | Prominence | ||||||||||
| ϕ range | N | θ | ln R0 | θ | ln R0 | θ | ln R0 | θ | ln R0 | θ | ln R0 | θ | ln R0 | θ | ln R0 | θ | ln R0 |
| [-120, 0] | 1431 | 10.1 | 1.56 | 10.7 | 1.55 | 13.7 | 2.0 | 14.2 | 2.0 | 16.1 | 2.24 | 15.0 | 2.26 | 22.1 | 2.46 | 21.3 | 2.47 |
| [-90, 0] | 1331 | 10.2 | 1.56 | 10.6 | 1.55 | 14.5 | 2.0 | 14.8 | 2.0 | 16.0 | 2.24 | 15.6 | 2.25 | 22.0 | 2.46 | 20.9 | 2.48 |
| [-120, 30] | 2012 | - | - | - | - | 13.4 | 2.01 | 15.7 | 1.99 | 17.3 | 2.21 | 16.7 | 2.22 | 21.6 | 2.47 | 21.2 | 2.47 |
| [-90, 30] | 1912 | - | - | - | - | 14.3 | 2.0 | 15.5 | 1.99 | 17.5 | 2.21 | 17.0 | 2.22 | 21.5 | 2.47 | 20.9 | 2.47 |
| [-60, 30] | 1637 | - | - | - | - | 11.4 | 2.01 | 15.0 | 1.99 | 19.3 | 2.22 | 18.7 | 2.22 | 21.3 | 2.47 | 20.7 | 2.47 |
| [-120, 60] | 2422 | - | - | - | - | 13.6 | 2.01 | 15.7 | 1.99 | 17.9 | 2.2 | 16.9 | 2.21 | 20.2 | 2.48 | 20.8 | 2.48 |
| [-90, 60] | 2322 | - | - | - | - | 14.2 | 2.0 | 15.5 | 1.99 | 18.6 | 2.21 | 17.3 | 2.21 | 20.2 | 2.48 | 20.6 | 2.48 |
| [-60, 60] | 2047 | - | - | - | - | 12.1 | 2.01 | 15.0 | 2.0 | 19.7 | 2.22 | 19.1 | 2.22 | 20.0 | 2.48 | 20.3 | 2.48 |
| [-30, 60] | 1518 | - | - | - | - | 12.0 | 2.01 | 14.7 | 2.0 | 22.7 | 2.25 | 21.5 | 2.24 | 18.4 | 2.47 | 22.5 | 2.47 |
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