Table 6
Summary of identified spiral arms and their velocity ranges along to the observed sightlines.
| Source | Local | Aquila-Rift | Perseus | Sagittarius-Carina | Scutum-Centaurus | 3-kpc | Inter-arm | Unidentified clouds |
|---|---|---|---|---|---|---|---|---|
| (Galactic bar/center) | or envelope | |||||||
| (km s–1) | (km s–1) | (km s–1) | (km s–1) | (km s–1) | (km s–1) | (km s–1) | (km s–1) | |
| W3 IRS5 | –11.8,3.6 | … | –35.8, –16.1 | … | … | … | … | … |
| W3(OH) | –16.0,3.6 | … | –35.6, –16.0 | … | … | … | … | … |
| NGC 6334 I | … | … | … | … | … | … | … | 4.0, 10.0 |
| HGAL0.55–0.85 | … | … | … | … | … | … | … | –10.0, –4.6 |
| G09.62+0.19 | … | … | … | … | 10.0, 40.0 | … | … | 60.0, 75.0 |
| G10.47+0.03 | … | … | … | 3.2, 20.0 | 20.0, 50.0 | 80.0, 180(a) | –14.4, 2.4 | … |
| G19.61–0.23 | … | … | … | 35.0, 93.0 | 105.8, 113.9 | 93.0, 127.0 | –10.0, 20.0 | 28.0, 40.0 |
| G29.96–0.02 | … | 1.6, 18.4 | … | 37.0, 85.0 | … | … | … | … |
| W43 MM1 | –5.0,5.0 | 5.0, 21.4 | … | 21.4, 50.0 | … | … | … | 50.0, 100.0 |
| G31.41+0.31 | 0.0, 20.0 | … | … | 30.0, 58.0 | … | … | … | … |
| *G32.80+0.19 | … | 5.0, 6.0 | … | 15.0, 57.0 | 58.0, 120.0 | … | … | |
| G45.07+0.13 | –2.0, 20.0 | … | … | 20.0, 60.0 | … | … | … | 60.0, 79.0 |
| DR21 | … | … | … | … | … | … | … | 5.0, 20.0 |
| NGC 7538 IRS1 | –12.2, 4.4 | … | … | … | … | … | … | … |
Notes. In the last column, “envelope” refers to the diffuse and translucent molecular gas layers surrounding dense molecular gas regions associated with the background continuum sources. For the source (G32.80+0.19) marked by an asterisk, its velocity intervals of crossing spiral arms are based on Reid et al. (2019). (a)The velocities from 120–180 km s–1 belong to the 135 km s–1 arm situated beyond the GC.
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