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Table 2

OH+ and OH lines detected with PACS.

λ0 λOBS Surface S/Nb
(μm) (μm) brightnessa

NGC 6781 – centre
OH 119.23 119.24 (4.1 ± 0.7) 2.4
OH 119.44 119.43 (4.5 ± 0.8) 2.1
OH+ 152.99 153.02 2.2 ± 0.5 4.9
NGC 6781 – west rim
OH 119.23 119.25 12.4 ± 2.8 5.1
OH 119.44 119.44 12.9 ± 2.3 6.8
OH+ 152.99 153.03 3.6 ± 0.6 5.6

NGC 6720
OH 119.23 119.26 11.6 ± 1.4 9.1
OH 119.44 119.44 11.4 ± 1.6 7.5
OH+ 152.99 153.02 3.2 ± 0.9 7.5

NGC 6445
OH 119.23 119.24 0.245 ± 0.020 8.1
OH 119.44 119.44 0.24 ± 0.04 12
OH+ 152.37 152.42 2.6 ± 0.7 3.7
OH+ 152.99 153.01 3.7 ± 0.8 6.7

Notes.

(a)

Surface brightness in 10-17 erg cm-2 s-1 arcsec-2. See text for details on the measurements. Numbers in parentheses are below the 3σ detection limit. Errors obtained from the reduction process are shown. The absolute calibration uncertainty is 30% and should be added to these values.

(b)

Signal-to-noise ratio.

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