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This article has an erratum: [https://doi.org/10.1051/0004-6361/201219416e]

Table 1

Parameters of the observed absorption lines.

Line ν A ul η beam θ beam 1σ RMS T cont V LSR a FWHM a ∫τdVLSR N mol
(MHz) (10-2 s-1) (%) (′′) (mK) (K) (km s-1) (km s-1) (km s-1) (1012 cm-2)
OMC-2 FIR 4
CH+(1–0) 835137.5 0.64 74.7 26 41 0.48 9.5 ± 0.1 6.1 ± 0.2 12.0 ± 1.6 34.4 ± 4.5
OH+(10,1/2–01,3/2) 909158.8 1.05 74.4 24 33 0.54 9.3 ± 0.1 2.6 ± 0.4 1.1 ± 0.4 23.1 ± 7.4
OH+(12,5/2–01,3/2)b 971803.8 1.82 74.1 22 95 0.58 9.2 ± 0.1 3.3 ± 0.3 5.0 ± 1.6 23.8 ± 7.3
OH+(11,1/2–01,1/2)b 1032997.9 1.41 74.1 24 52 0.63 9.4 ± 0.1 2.9 ± 0.4 1.1 ± 0.4 24.9 ± 7.9
OH+(11,3/2–01,3/2)b 1033118.6 1.76 74.1 24 52 0.63 9.3 ± 0.2 3.2 ± 0.5 2.6 ± 0.6 22.7 ± 4.8
o-H2O+(11,1–00,0)d 1115204.0 3.02 63.7 19 72 0.68 8.2 ± 0.3 4.4 ± 0.8 1.8 ± 0.4 7.6 ± 1.9
H3O+(001–100)c 984708.7 2.30 74.1 22 52 0.59 – –  <0.8  <0.8
HF(1–0) 1232476.3 2.42 63.7 17 130 0.75 10.0 ± 0.1 2.8 ± 0.3 4.8 ± 1.4 12.3 ± 3.4
OMC-3 MM6
OH+(10,1/2–01,3/2)b 909158.8 1.05 74.4 24 13 0.58 – –  <0.1  <3.0

Notes. 

(a)

Measured from a Gaussian fit to the line.

(b)

Blended with another hyperfine component (see Fig. 1); Nmol estimated assuming that all flux comes from this component.

(c)

Undetected: 3σ upper limits are given for ∫τdVLSR and Nmol, assuming FWHM = 2.6 km s-1.

(d)

F = 5/2−3/2 transition; rest frequency from Mürtz et al. (1998).

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