Linking low- to high-mass young stellar objects with Herschel-HIFI observations of water

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Table 5

Averaged values of H₂O line intensity ratios for the shocked gas along the outflow cavity (broad component), beam size ratios of those transitions and the ratios of the optically thin and thick solutions at T_ex = 300 K.

Transitions	Observed ratio			θ₁/θ₂	Thin^a	Thick^a
	LM	IM	HM		(LTE)	(LTE)

H₂O 2₁₁–2₀₂/2₀₂–1₁₁	0.57 ± 0.14	0.60 ± 0.18	1.2 ± 0.2	1.31	1.85	1.02
H₂O 3₁₂–3₀₃/2₀₂–1₁₁	0.52 ± 0.12	0.71 ± 0.16	0.8 ± 0.2	0.90	17.58	2.97
H₂O 3₁₂–3₀₃/2₁₁–2₀₂	1.0 ± 0.3	0.94 ± 0.08	0.7 ± 0.2	0.68	3.16	0.97

Notes. LM: low-mass protostars; IM: intermediate-mass YSOs; HM: high-mass objects. The ratios are not corrected for different beam sizes.

^(a)

Line intensity ratio calculated for an excitation condition of 300 K and assuming LTE.

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