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Table 7

Excitation temperatures and column densities.

Texa Ntot[HDO]b Ntot[HO]b Ntot[SO2]b X[HDO]c X[HO]c X[SO2]c
Component (K) (×1015 cm-2) (×1016 cm-2) (×1015 cm-2) (×10-8) (×10-7) (×10-8)
Blue-shifted 120–165 2.7–3.9 1.1 3.0–4.8 ... ... ...
Systemic 155–240 4.0–5.5 1.6 4.7–7.3 ... ... ...
Red-shifted 120–165 3.5–5.1 1.4 4.0–6.5 ... ... ...
Overall ... 10.2–14.5 4.1 11.7–18.6 4.4–6.2 1.7 4.9–7.9

Notes. 

(a)

Excitation temperatures estimated from column density ratios. See Sect. 3.2.4 for details.

(b)

Total column density derived under LTE and optically thin assumptions.

(c)

With respect to H2. Assuming a dust temperature of 200 K, Ntot[H2] of 2.35 × 1023 cm-2 is derived from the 203.4-GHz continuum at a resolution of , PA 26°. The uncertainty in Ntot[H2] is not considered.

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