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Home All issues Volume 700 (August 2025) A&A, 700 (2025) A171 Full HTML
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Table A.1

OH, HI, and H2 column densities

OH 1667 MHz OH 1665 MHz OH 1612 MHz OH 1720 MHz HI 12CO 13CO C18O 13CO
J=1-0 J=1-0 J=1-0 J=1-0
Source vmid RGC ∫τdv τmax ∫τdv τmax ∫τdv τmax ∫τdv τmax ∫τdv τmax NOHTex$\frac{N_{\rm OH}}{T_{\rm ex}}$ NHITS$\frac{N_{\rm \ion{H}{i}}}{T_{\rm S}}$ ∫ Tmb dv ∫ Tmb dv ∫ Tmb dv ∫ Tmb dv NH2
[km s-1] [kpc] [km s-1] [km s-1] [km s-1] [km s-1] [km s-1] x1013cm−2Kx$10^{13}\frac{{\rm cm}^{-2}}{{\rm K}}$ x1019cm−2Kx$10^{19}\frac{{\rm cm}^{-2}}{{\rm K}}$ [K km s-1] [K km s-1] [K km s-1] [K km s-1] x1020cm-2
G21.347-0.629 +7.4 7.64 +0.25 +0.14 +0.14 +0.07 <0.07 <0.01 +0.03 +0.02 >18.95 >3.66 24.5 1.5 <1.3 1.5 49.0
+51.6 5.07 +0.36 +0.14 +0.17 +0.07 +0.00 +0.01 +0.06 +0.04 >10.82 >3.64 8.09 >1.97 51.9 11.5 <1.3 11.5 103.7
+56.5 4.87 +0.50 +0.37 +0.32 +0.28 -0.04 +0.00 +0.15 +0.13 >9.04 >3.70 11.17 >1.65 22.2 9.7 2.9 9.7 44.5
+73.5 4.24 +0.13 +0.04 +0.06 +0.03 +0.04 +0.02 <0.06 <0.01 +7.31 +1.38 2.86 1.33 16.1 <1.3 <1.3 <1.3 32.1
+68.8 4.41 +0.05 +0.06 +0.02 +0.03 <0.02 <0.01 <0.02 <0.01 +0.58 +0.36 1.13 0.11 <2.4 <1.3 <1.3 <1.3 <4.9
+66.6 4.48 +0.05 +0.05 +0.03 +0.03 <0.02 <0.01 <0.02 <0.01 +0.50 +0.27 1.07 0.09 2.2 <1.3 <1.3 <1.3 4.4
G29.957-0.018 +6.5 7.87 +0.19 +0.12 +0.11 +0.07 +0.08 +0.06 -0.03 +0.01 +4.19 +1.56 4.27 0.76 12.9 2.2 <1.3 2.2 25.8
+9.7 7.68 +0.08 +0.07 +0.05 +0.04 +0.04 +0.03 <0.02 <0.01 +2.67 +1.14 1.84 0.49 2.6 <1.3 <1.3 <1.3 5.1
+67.5 5.18 +0.10 +0.03 +0.05 +0.02 +0.04 +0.02 <0.06 <0.01 +7.55 +1.26 2.15 1.38 21.9 4.3 <1.3 4.3 43.8
+97.8 4.32 +0.14 +0.06 +0.09 +0.04 -0.03 +0.02 +0.08 +0.06 >13.24 >3.59 3.18 >2.41 160.6 63.9 13.9 63.9 321.1∗
+102.8 4.19 +0.14 +0.06 -0.25 +0.01 -0.19 +0.00 +0.16 +0.07 >12.18 >3.59 3.21 >2.22 87.1 24.6 4.4 24.6 174.1∗
12CO 13CO C18O
J=2–1 J=2–1 J=2–1
G29.935-0.053 +7.5 7.81 +0.15 +0.07 +0.09 +0.05 +0.08 +0.05 <0.12 <0.04 +5.53 +1.29 3.47 1.01 3.4 0.4 <0.2 <1.3 9.8
+50.8 5.77 +0.29 +0.14 +0.13 +0.06 <0.12 <0.04 <0.11 <0.04 >11.84 >2.64 6.39 >2.16 22.5 5.6 0.8 7.8 64.3
+68.0 5.17 +0.20 +0.14 +0.13 +0.09 +0.09 +0.05 <0.08 <0.04 >8.30 >2.62 4.56 >1.51 9.9 1.1 <0.2 3.2 28.4
+99.0 4.29 +0.76 +0.26 +0.64 +0.18 -0.07 +0.03 +0.27 +0.08 >18.10 >2.64 17.07 >3.30 113.7 58.1 18.2 72.3 377.5a,*
G31.388-0.383 -3.8 8.54 +0.10 +0.07 +0.04 +0.03 +0.03 +0.02 <0.03 <0.02 +1.16 +0.57 2.27 0.21 1.5 0.2 <0.2 <0.9 4.3
+18.0 7.25 +0.22 +0.14 +0.11 +0.08 +0.04 +0.03 +0.02 +0.02 >22.74 >3.89 4.98 >4.14 7.6 0.6 <0.2 <0.9 21.8
+37.0 6.38 +0.03 +0.04 <0.03 <0.02 <0.03 <0.02 <0.03 <0.02 +2.15 +0.88 0.74 0.39 0.3 <0.2 <0.2 <0.9 0.8
+73.1 5.11 +0.12 +0.04 +0.06 +0.03 +0.07 +0.02 -0.06 +0.00 +17.18 +3.59 2.58 3.13 7.3 0.5 <0.2 2.5 20.9
+78.1 4.96 +0.12 +0.12 +0.07 +0.07 +0.03 +0.02 +0.01 +0.02 +5.67 +2.39 2.64 1.03 2.0 0.2 <0.2 0.7 5.8
+81.8 4.85 +0.06 +0.04 <0.03 <0.02 <0.03 <0.02 <0.03 <0.02 >11.84 >3.85 1.37 >2.16 3.6 0.4 <0.2 1.0 10.4
+85.3 4.75 +0.11 +0.07 +0.03 +0.03 <0.03 <0.02 +0.03 +0.02 >13.04 >3.87 2.53 >2.38 2.8 0.2 <0.2 0.4 7.9
+92.0 4.57 +0.05 +0.04 +0.04 +0.02 <0.03 <0.01 <0.03 <0.02 +6.65 +2.47 1.19 1.21 4.7 0.5 <0.2 1.5 13.4

Notes. Integral and peak of the optical depth of the OH and H I lines, as well as of integrated CO emission. As we do not derive the excitation temperatures of the OH and H I lines in this work, we report NOH/Tex and NHI/TS. (*) Features associated with HII regions. All other features are line-of-sight absorption features. (a) Using 13CO J = 1 - 0 and correcting for isotope ratio variations over Galactocentric distance (Sect. 3.2).

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