Table 2
Derived spiral arm structure at the Perseus, Norma, and Crux tangencies.
| Spiral arm | Perseus | Norma | Crux 1 |
|
|
|||
| Relative lane location wrt 12 CO (pc) | |||
| [C ii]–WIM peak | −190 | −190 | −600 |
| H i peak | −20 | −25 | −180 |
|
|
|||
| Emission lane width 2 (pc) | |||
| [C ii]–WIM | 250 | 270 | ~220 |
| 12CO | 400 | 400 | ~440 |
| H i | 400 | 620 | ~640 |
| Full arm width traced by [C ii] and 12CO | 480 | 500 | ~940 |
|
|
|||
| WIM parameters at the tangency | |||
| Width ΔV (km s-1) | 16 | 17 | 12 |
| Intensity (K km s-1) | 5.1 | 4.11 | 13.74 |
| Path length3 (kpc) | 1.31 | 1.58 | 1.72 |
| ⟨ n(e) ⟩ 4 (cm-3) | 0.52 | 0.42 | 0.74 |
Notes.
This longitude range is offset from the true tangency and therefore the parameters listed are only indicative of the trends within the arm structure.
FWHM as estimated using the profile on the rising side (near side to the Galactic center)–see text.
Assuming that the [C ii] emission here is due to C+ excitation by electrons and that excitation by H atoms is negligible (cf. Velusamy et al. 2012; Velusamy & Langer 2014).
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