Table 2
Tangential directions of spiral arms derived from observations (part of the references are taken from the collection by Englmaier & Gerhard 1999 as shown in their Table 1).
| Tracers and references | Near 3 kpc | Scutum | Sagittarius | Carina | Centaurus | Norma | Far 3 kpc |
| (°) | (°) | (°) | (°) | (°) | (°) | (°) | |
|
|
|||||||
| HI: wea70, bs70, hen77 | 50 | 310 | 328 | ||||
| integrated 12CO: ccdt80, gcb+87 | 24 | 30.5 | 49.5 | 310 | 330 | ||
| 12CO clouds: dect86 | 25 | 32 | 51 | ||||
| warm CO clouds: ssr85 | 25 | 30 | 49 | ||||
| HII regions: loc89, dwbw80 | 24 | 30 | 47 | 305 | 332 | ||
| 26Al: cgdh96 | 46 | 310 | 325 | ||||
| Radio 408 MHz: bkb85 | 48 | 310, 302 | 328 | 339 | |||
| 2.4 μm: hmm+81 | 332 | 339 | |||||
| 60 μm: bdt90 | 313 | 329 | 340 | ||||
| 12CO: bro92 | 25 | 33 | 55 | 282 | 309 | 328 | 337 |
| 12CO: bro08 | 308 | 328 | 336 | ||||
| 12CO: ban80, cd76 | 23.5 | ||||||
| 12CO: dt08 | 23 | 337 | |||||
|
|
|||||||
| Median | 24 | 30.5 | 49.3 | 282 | 310 | 328 | 338 |
Notes. The median values are adopted in this work if there is more than one measurement. bs70: Burton & Shane (1970); bkb85: Beuermann et al. (1985); bdt90: Bloemen et al. (1990); bro92: Bronfman (1992); bro08: Bronfman (2008); ban80: Bania (1980); ccdt80: Cohen et al. (1980); cgdh96: Chen et al. (1996); cd76: Cohen & Davies (1976); dect86: Dame et al. (1986); ssr85: Solomon et al. (1985); dt08: Dame & Thaddeus (2008); dwbw80: Downes et al. (1980); hen77: Henderson (1977); hmm+81: Hayakawa et al. (1981); gcb+87: Grabelsky et al. (1987); loc89: Lockman (1989); wea70: Weaver (1970).
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