Water and ammonia abundances in S140 with the Odin satellite

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Table 1:

All molecular transitions are observed with the Odin satellite except the ¹³CO(1-0) map which is observed with the Onsala 20-m telescope.
Species	Transition	Freq.	$E_{\rm u}^a$	$n_{\rm crit}^b$	Int. time
		[MHz]	[K]	[ cm^-3]	[h]
H₂O	1_1,0-1_0,1	556 936.0	61	$3\times10^{8~~c}$	41
H₂¹⁸O	1_1,0-1_0,1	547 676.4	60	$3\times10^{8~~c}$	91
CO	5-4	576 267.9	83	$2\times10^{5~~c}$	9
¹³CO	5-4	550 926.3	79	$2\times10^5$	9
¹³CO	1-0	110 210.4	5	$7\times10^2$	2 min/pos
NH₃	1₀-0₀	572 498.1	29	$5\times10^{7~~c}$	16

^a Upper state energy; ^b critical density calculated for a temperature of 40 K;
^c can be considerably reduced because of radiative trapping.

Source LaTeX | All tables | In the text

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