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Table 4

Synoptic summary of results.

Sightline Spiral arma υ min , υ max N(OH) N(OH+) N(H2) (b) X(OH)c X(OH+)c H2
[km s-1 ] [1014 cm-2] [1020 cm-2] × 10-7 proxy

G10.47 (−20,0) 5.5 ± 1.8 1.2 ± 0.1 10.7 ± 0.2 7.9 ± 1.0 4.33 ± 0.11 CH
Sgr (0, + 50) 19 ± 4 4.8 ± 0.3 277 ± 3 0.83 ± 0.17 0.27 ± 0.01 CH
Gal. bar (+ 80, + 170) 7.3 ± 0.3 4.6 ± 0.1 1167 ± 8 0.107 ± 0.001 0.07 ± 0.01 CH
G10.62d Sgr (+ 7, + 15) 0.95 ± 0.01 0.67 ± 0.04 8.21 ± 0.09 1.25 ± 0.02 1.12 ± 0.09 HF
Sgr (+ 42, + 55) 1.52 ± 0.05 0.25 ± 0.02 11.24 ± 0.26 1.47 ± 0.13 0.14 ± 0.01 CH
12.08 ± 0.34 2.82 ± 0.79 0.28 ± 0.02 HF
Scutum (+ 65, + 80) 0.22 ± 0.01
G34.26 Sgr (0, + 15) 1.34 ± 0.15 0.43 ± 0.02 14.41 ± 0.47 5.1 ± 6.4 0.69 ± 0.59 HF
Sgr (+ 15, + 30) < 0.001 0.26 ± 0.01 9.39 ± 0.23 < 0.005 1.05 ± 0.14 HF
(+ 38, + 46) 0.37 ± 0.01 0.20 ± 0.01 3.39 ± 0.07 0.59 ± 0.02 1.35 ± 0.54 HF
(+ 62, + 85) 5 ± 13 0.023 ± 0.001 13.19 ± 0.67 49 ± 69 0.048 ± 0.027 HF
W49N interarm (+ 20, + 30) 0.83 ± 0.18 0.93 ± 0.01 22.9 ± 0.3 0.33 ± 0.03 0.40 ± 0.01 CH
4.2 ± 0.1 2.22 ± 0.20 2.79 ± 0.10 HF
Sgre (+ 30, + 45) 3.9 ± 0.1 2.17 ± 0.01 39.3 ± 0.9 0.93 ± 0.03 0.67 ± 0.02 CH
36.6 ± 0.7 1.06 ± 0.02 0.85 ± 0.01 HF
Sgrf (+ 45, + 70) 4.0 ± 0.1 1.8 ± 0.1 70.3 ± 0.5 0.55 ± 0.01 0.42 ± 0.01 CH
46.6 ± 0.5 1.54 ± 0.09 2.11 ± 0.17 HF
W51e2 Sgr (0, + 15) 1.4 ± 0.2 0.43 ± 0.03 28.5 ± 7.0 0.49 ± 0.11 0.16 ± 0.04 CH
11.6 ± 0.1 4.41 ± 4.47 1.30 ± 0.96 HF
(+ 15, + 35) < 0.1 0.28 ± 0.03 1.32 ± 0.07 < 1.0 2.92 ± 0.72 HF
(+ 40, + 50) 0.91 ± 0.04 0.37 ± 0.01 25.9 ± 5.1 0.28 ± 0.06 0.16 ± 0.02 CH
10.5 ± 0.2 1.17 ± 0.15 1.39 ± 0.14 HF
G327.29 Carina (−25, + 10) 2.6 ± 0.1 0.58 ± 0.01 37.1 ± 19.8 1.86 ± 0.77 0.77 ± 0.43 CH
G330.95 Crux (−70,−50) 4.0 ± 0.3 0.81 ± 0.02 89 ± 12 0.39 ± 0.04 0.09 ± 0.01 CH
Crux (−50,−25) 11 ± 1 0.64 ± 0.01 84.4 ± 7.6 0.77 ± 0.09 0.16 ± 0.01 CH
Carina (−25, + 5) 0.027 ± 0.005 0.08 ± 0.01 0.80 ± 0.19 0.37 ± 0.11 0.97 ± 0.84 CH
G332.83 Norma (−74,−65) 0.20 ± 0.11 0.007 ± 0.001
Crux (−38,−30) 0.55 ± 0.06 0.31 ± 0.02
Crux (−30,−10) 1.7 ± 0.1 0.55 ± 0.01
G351.58 Crux, Norma (−65,−35) 3.3 ± 0.2 1.0 ± 0.1
Carina (−5, + 5) 0.42 ± 0.12 0.42 ± 0.02

Notes. Column densities are integrated across the velocity intervals given in Col. 3. Abundances are mean values across the indicated velocity intervals. Data affected by saturated absorption are not considered.

(a)

Spiral arms: Sgr/Car Sagittarius-Carina arm, Crux/Scu Crux-Scutum arm;

(b)

using [CH]/[H2] = 3.5 × 10-8 (Sheffer et al. 2008) and [HF]/[H2] = 1.4 × 10-8 (cf. Appendix E);

(c)

velocity-interval averaged abundances with respect to H2;

(d)

alias W31C (the CH spectrum was not used for the υlsr = (7,15) km s-1 interval due to blend with emission);

(e)

near- and far-side crossing of Sagittarius arm;

(f)

far-side crossing.

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