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Table 3

3σ upper limits to undetected HO and 18OH lines.

Line λrest Line peaka Fluxab Predicted fluxc
(μm) (Jy) (Jy km s-1) (Jy km s-1)
HO 422 → 313 57.840 < 0.99 < 210 ...
HO 524 → 413 71.754 < 1.20 < 210 ...
HO 606 → 515 83.591 < 1.19 < 170 ...
HO 313 → 202 139.586 < 1.32 < 370 ...
HO 220 → 211 250.034 < 0.54 < 160 ...
HO 422 → 413 252.167 < 0.51 < 150 ...
HO 312 → 303 253.762 < 0.48 < 140 ...
HO 321 → 312 263.738 < 0.51 < 160 ...
18OH 65.543 < 1.59 < 310 −40
18OH 65.690 < 1.59 < 310 −40
18OH 71.679 < 1.05 < 190 −10
18OH 84.947 < 1.62 < 230 −230
18OH 85.123 < 1.62 < 230 −230
18OH 120.171 d < 1.23 < 380 −330
18OH 164.269 < 0.90 < 220 30
18OH 164.545 < 0.90 < 220 30

Notes.

(a)

Upper limits are to the absolute values.

(b)

Upper limits to the fluxes were calculated using the instrument resolution and assuming a Gaussian profile for lines observed with PACS and a sinc profile for lines observed with SPIRE.

(c)

Predicted flux, for the 18OH lines, from the inner component using the limiting value NOH/τ50 = 5 × 1015, corresponding to a lower limit on the 16O/18O ratio of 400.

(d)

The blue component of the 18OH doublet at 120μm is close to the CH+3−2 absorption line and we only estimate an upper limit for the red component.

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