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Table 1

Studied species and transitions.

Species Transition Hyperfine Frequency ΔυHFS A E E U Origin
component [GHz] [km s-1 ] [s-1] [K]

O i 4744.7775 8.91 × 10-5 227.76 GREAT
OH F = 2 ← 2+ 2514.2987 + 2.1 0.0137 120.75 GREAT
F = 3 ← 2+ 2514.3167 0.0 0.1368
F = 2 ← 1+ 2514.3532 −4.4 0.1231
HF J = 1 ← 0 1232.4763 0.0242 59.15 HIFI
OH+ N = 1 ← 0,J = 1 ← 1 F = 1/2 ← 1/2 1032.9979 + 35.0 0.0141 49.58 APEX
F = 3/2 ← 1/2 1033.0044 + 33.1 0.0035
F = 1/2 ← 3/2 1033.1118 + 2.0 0.0070
F = 3/2 ← 3/2 1033.1186 0.0 0.0176
N = 1 ← 0,J = 2 ← 1 F = 5/2 ← 3/2 971.8038 0.0 0.0182 46.64 HIFI
F = 3/2 ← 1/2 971.8053 −0.46 0.0152
F = 3/2 ← 3/2 971.9192 −35.6 0.0030
CH N = 1,J = 3/2 ← 1/2 F = 2 ← 1+ 536.7611 19.3 0.0006 25.76 HIFI
F = 1 ← 1+ 536.7819 7.7 0.0002
F = 1 ← 0+ 536.7957 0.0 0.0004

Notes. Frequencies, Einstein coefficients, and upper level energies are from the JPL (Pickett et al. 1998) and CDMS (Müller et al. 2001) databases.

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