Free Access
Table 3
Tangential directions of spiral arms derived from the best-fitted models.
| Models\Spiral arms | Near 3 kpc | Scutum | Sagittarius | Carina | Centaurus | Norma | Far 3 kpc |  /N |
| 24° | 30.5° | 49.3° | 282° | 310° | 328° | 338° | ||
|
|
||||||||
| Best-fitted models to HII regions, R0 = 8.5 kpc, Θ0 = 220 km s-1. | ||||||||
| 3-arm model | 22.6 [1.4] | 34.7 [4.2] | 57.5 [8.2] | 285.0 [3.0] | 312.5 [2.5] | 327.4 [0.6] | 1.7 | |
| 4-arm model | 22.1 [1.9] | 33.6 [3.1] | 55.3 [6.0] | 284.7 [2.7] | 309.8 [0.2] | 324.2 [3.8] | 1.4 | |
| PL model | 24.3 [0.3] | 33.3 [2.8] | 51.1 [1.8] | 286.1 [4.1] | 310.2 [0.2] | 326.8 [1.2] | 0.9 | |
|
|
||||||||
| Best-fitted models to all three kinds of spiral tracers. | ||||||||
| 3-arm model | 22.3 [1.7] | 37.5 [7.0] | 58.7 [9.4] | 283.7 [1.7] | 310.9 [0.9] | 327.4 [0.6] | 2.0 | |
| 4-arm model | 21.2 [2.8] | 34.9 [4.4] | 54.1 [4.8] | 286.1 [4.1] | 311.9 [1.9] | 326.8 [1.2] | 1.4 | |
| PL model | 24.9 [0.9] | 33.6 [3.1] | 50.8 [1.5] | 286.5 [4.5] | 310.1 [0.1] | 326.6 [1.4] | 1.0 | |
|
|
||||||||
| Best-fitted models to HII regions, R0 = 8.3 kpc, Θ0 = 239 km s-1. | ||||||||
| 3-arm model | 21.9 [2.1] | 35.1 [4.6] | 54.6 [5.3] | 286.1 [4.1] | 312.8 [2.8] | 328.0 [0.0] | 1.5 | |
| 4-arm model | 22.4 [1.6] | 33.5 [3.0] | 54.7 [5.4] | 285.9 [3.9] | 310.8 [0.8] | 324.1 [3.9] | 1.4 | |
| PL model | 23.8 [0.2] | 32.5 [2.0] | 49.7 [0.4] | 288.9 [6.9] | 310.2 [0.2] | 327.3 [0.7] | 1.2 | |
|
|
||||||||
| Best-fitted models to all three kinds of spiral tracers. | ||||||||
| 3-arm model | 21.6 [2.4] | 36.0 [5.5] | 55.3 [6.0] | 287.0 [5.0] | 312.3 [2.3] | 328.1 [0.1] | 1.7 | |
| 4-arm model | 22.4 [1.6] | 35.8 [5.3] | 53.9 [4.6] | 287.6 [5.6] | 311.9 [1.9] | 326.3 [1.7] | 1.6 | |
| PL model | 22.9 [1.1] | 32.7 [2.2] | 51.7 [2.4] | 288.7 [6.7] | 310.6 [0.6] | 327.9 [0.1] | 1.3 | |
Notes. The deviations between the modeled and observed tangential
directions (
, see Table 2 for 
) are
given in brackets.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.