Open Access
Table 4
OH1667 optical depths and column densities for the +50 and +20 km s-1 clouds, the CND, the EMR, and the line-of-sight spiral arm features.
| Source | V peak | ΔVFWHM | τ1667 | Tex | N(OH) |
| ( km s-1) | ( km s-1) | (K) | (cm-2) | ||
|
|
|||||
| +50 km s-1 | 49 | 31 | 4.3 (+NA/−1.4) | 40 | 1.2 × 18a |
| CND | 17 | 84 | 1.9 (+0.4/−0.3) | 80 | 2.9 × 1018a |
| +20 km s-1 | 23 | 42 | 3.3 (+0.9/−0.4) | 40 | 1.2 × 1018a |
| EMR near side | −128 | 55 | 0.9 (+0.4/−0.3) | 30 | 3.3 × 1017(+1.5/−1.1) |
| Local/Sgr arm | −6 | 16 | 1.1 (+0.5/−0.4) | 3 | 1.2 × 1016(+0.5/−0.4) |
| −30 km s-1 arm | −27 | 10 | 1.6 (+0.7/−0.5) | 3 | 1.1 × 1016(+0.4/−0.4) |
| 3-kpc arm | −54 | 13 | 1.6 (+0.7/−0.5) | 3 | 1.4 × 1016(+0.6/−0.4) |
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