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Table 5

Abundances of OH and of OH+ with respect to O i .

T c a υ min , υ max N(O i ) b b
[K] [km s-1 ] [1018 cm-2] N(OH+)

G10.62 2.6 (7,15) 1.71 ± 0.02 0.210 ± 0.004 1.84 ± 0.07
(42,55) 2.02 ± 0.04 0.144 ± 0.005 5.54 ± 0.43
G34.26 3.0 ( 0,15) 1.62 ± 0.02 0.133 ± 0.004 3.87 ± 0.49
(15,30) 1.78 ± 0.02 0.079 ± 0.002 < 0.004
(38,46) 1.19 ± 0.01 0.090 ± 0.002 1.69 ± 0.03
W49N 3.5 (20,30) 1.33 ± 0.02 0.145 ± 0.003 0.82 ± 0.06
(30,45) 5.45 ± 0.11 0.271 ± 0.004 1.68 ± 0.02
(45,60) 8.0 ± 2.7 0.227 ± 0.003 2.34 ± 0.04

Notes. Velocity intervals and spiral arm assignments as in Table 4. With the following exceptions: G10.62 (alias W31C) – The υlsr = (65,80) km s-1 interval from Table 4 is not reported because only OH+ was found there. G34.26 – The υlsr = (62,85) km s-1 interval from Table 4 is not reported because the O i line turns into emission there. W49N – The velocity interval for the far-side crossing of the Sagittarius spiral arm is only taken up to υlsr = 60 km s-1 because the O i absorption beyond is saturated.

(a)

Main-beam temperature of 4.744 THz continuum (Rayleigh-Jeans scale).

(b)

Error estimates do not account for systematic uncertainties and are derived from χ2 of fits by formal error propagation.

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