Ortho-to-para ratio of interstellar heavy water | Astronomy & Astrophysics (A&A)

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Table 1:

Derived parameters of the ortho and para D₂O fundamental lines.
Species	Transition	Frequency	Telescope	$\int T {\rm d}v$	$T_{\rm abs} = T_{\rm C}-T_{\rm L}$	$\Delta V$	$V_{\rm LSR}$	$T_{\rm C}$	$\tau$
		GHz		(mK km s^-1)	(mK)	(km s^-1)	(km s^-1)	(mK)
ortho-D₂O	1_1,1-0_0,0	607.34945	Herschel	77 $\pm$ 17	108 $\pm$ 11	0.57 $\pm$ 0.09	4.33 $\pm$ 0.04	234 $\pm$ 19	0.62 $\pm$ 0.11
para-D₂O	1_1,0-1_0,1	316.79981	JCMT	120 $\pm$ 49	220 $\pm$ 30	0.55 $\pm$ 0.15	4.15 $\pm$ 0.04	850 $\pm$ 35	0.26 $\pm$ 0.05

Notes. Note that the parameters are in $T_{\rm a}^*$ for ortho-D₂O and $T_{\rm mb}$ for para-D₂O (see text).

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