Table 1
Tangent points of spiral arms in our Milky Way model as determined using different tracers as seen from the example observer position P1.
| Tangent point | CO(1–0) | NH | RM | Syn. 408 MHz | Dust 870 μm | ||||
|---|---|---|---|---|---|---|---|---|---|
| l[°] | l[°] | Δl[°] | l[°] | Δl[°] | l[°] | Δl[°] | l[°] | Δl[°] | |
| A | 16.46 | X | X | X | X | X | X | 7.91 | 8.55 |
| B | 26.76 | X | X | 23.47 | 3.29 | 24.68 | +2.08 | 20.76 | +6.00 |
| C | 38.30 | 38.38 | −0.08 | 34.11 | +4.19 | 35.31 | +2.99 | 38.38 | −0.08 |
| D | 71.97 | 74.45 | −2.48 | 65.08 | +6.89 | 65.56 | +6.41 | 70.72 | +1.25 |
| E | 270.30 | 264.01 | +6.29 | 267.88 | +2.42 | 270.00 | +0.30 | 265.69 | +4.61 |
| F | 304.46 | 304.30 | +0.16 | 305.81 | −1.35 | 304.52 | −0.06 | 305.11 | −0.65 |
| G | 321.21 | 319.48 | +1.73 | 321.53 | −0.32 | 320.65 | +0.56 | 319.83 | +1.38 |
| H | 333.20 | 329.75 | +3.45 | 332.62 | +0.58 | X | X | 332.11 | +1.09 |
| I | 341.35 | X | X | X | X | 341.13 | 0.22 | X | X |
| J | 348.91 | X | X | X | X | 347.18 | 1.73 | X | X |
Notes. The longitude of the tangent point is indicated by l, while Δl gives the difference with respect to the valuesdetermined from CO(1 → 0) (see Fig. 3). The X flags tangents with no detection. We note that the tabulated angles merely represent our Milky Way analog and are not to be directly compared with actual observations of the Milky Way.
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