Table 3
Parameters of the non-axisymmetric Galactic components (Pichardo et al. 2003, 2004) used in the Galactic potential.
| Parameter | Value | References |
|
|
||
| Spiral Arms | ||
|
|
||
| locus | Bisymmetric (Logthm) | 1 |
| pitch angle | 15.5° | 2 |
| external limit | 12 kpc | 2 |
| scale length | 2.5 kpc | Disk based |
| force contrast | ~10% | 3 |
| pattern speed | 20 km s-1 kpc-1 | 4 |
| Bar | ||
|
|
||
| major semi-axis | 3.5 kpc | 5 |
| scale lengths | 1.7, 0.64, 0.44 kpc | 5 |
| present major axis angle with | ||
| respect to the Sun-GC line | 20° | 6 |
| mass | 1.8 × 1010 M⊙ | 7 |
| angular velocity | 60 km s-1 kpc-1 | 8 |
References. 1) Churchwell et al. (2009). 2) Drimmel (2000). 3) Patsis et al. (1991). 4) Martos et al. (2004). 5) Freudenreich (1998). 6) Gerhard (2002). 7) Calchi Novati et al. (2008); Zhao (1996); Blum (1995); Dehnen & Binney (1998); Dwek et al. (1995); Kent (1992). 8) Debattista et al. (2002); Weiner & Sellwood (1999); Fux (1999); Ibata & Gilmore (1995); Englmaier & Gerhard (1999).
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