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Table 4

Observed O2 line intensity ratios.

Spectrum/ I(487)ab Tkin N (O2)
Position I(774) (K) (cm-2)

O1 (2.8 km s-1)  > 0.9   (3σ) <40  > 2 × 1015
O1 (3.6 km s-1) 0.58(±0.19) 78 5.4 × 1015
(+1σ) 0.77 47 5.0 × 1015
(−1σ) 0.39  ≫ 100 ...   
O3  >0.61   (3σ) <70  >3    × 1015
O4  >1.14   (3σ) <31  >6 × 1015
 ⟨ O1, O3, O4 ⟩  1.43( ± 0.94)c 25 3.4 × 1015
(+1σ) 2.37 18 4.6 × 1015
(−1σ) 0.49  >100 ...   

Notes. 

(a)

Errors are .

(b)

For HIFI, ηmb(487) = ηmb(737) = 0.75.

(c)

Similar to O3 for 1σ limit on 774 GHz intensity (1.47 ± 1.26).

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