Water and ammonia abundances in S140 with the Odin satellite

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Volume 494 / No 2 (February I 2009)

A&A, 494 2 (2009) 637-646

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Table 2:

Observations and model calculations for the narrow PDR component in the `RADEX` homogeneous model^a.
Species	Transition	Frequency	Observations			Ref.	Model calculations
		$\nu$	$T_{\rm b}$	$4\pi I$	$\Delta \upsilon$		$T_{\rm ex}$	$\tau$	$T_{\rm b}$	$4\pi I$
		[GHz]	[K]	[erg s^-1 cm^-2]	[km s^-1]		[K]		[K]	[erg s^-1 cm^-2]
H₂O	1_1,0-1_0,1	556.936	0.92	...	3.1	c	8.2	6.6	0.92	$6.8\times 10^{-6}$
H₂¹⁸O	1_1,0-1_0,1	547.676	<0.051	...	(3.1)^b	c	6.3	0.2	<0.05	< $3.5\times 10^{-7}$
NH₃	1₀-0₀	572.498	1.1	...	3.3	c	9.0	6.1	1.1	$9.2\times 10^{-6}$
	(1, 1)	23.695	2.9	...	...	d	54	0.02	0.87	$2.5\times 10^{-10}$
	(2, 2)	23.723	2.0	...	...	d	47	0.01	0.50	$1.7\times 10^{-10}$
	(3, 3)	23.870	1.4	...	...	d	-5.1	-0.25	2.2	$9.0\times 10^{-10}$
	(4, 4)	24.139	0.15	...	...	d	46	0.001	0.06	$3.8\times 10^{-11}$
¹³CO	2-1	220.399	12	...	3.3	e	55	0.2	9.1	$4.3\times 10^{-6}$
	5-4	550.926	14.7	...	3.2	c	51	0.5	14.7	$1.1\times 10^{-4}$
CS	2-1	97.981	8.6	...	3.0	f	47	0.2	9.1	$3.5\times 10^{-7}$
	3-2	146.969	10.2	...	3.0	f	20	1.0	10.0	$1.3\times 10^{-6}$
	5-4	244.936	5.4	...	3.0	f	13	1.3	5.5	$3.3\times 10^{-6}$
	6-5	293.912	3.3	...	2.2	f	12	0.7	3.1	$3.3\times 10^{-6}$
[C I]	1-0	492.161	3.7	...	3.5	g	54	0.1	3.7	$2.1\times 10^{-5}$
[C II]	3/2-1/2	1900.537	...	$4.4\times 10^{-3}$	...	h	55	1.0	13.4	$4.4\times 10^{-3}$
[O I]	1-2	4744.778	...	$4.1\times 10^{-3}$	...	h	46	0.9	0.88	$4.5\times 10^{-3}$

^a All results for $T_{\rm K}$ = 55 K, $n({\rm H}_2)$ = 4 $\times$ 10⁵ cm^-3. $T_{\rm b}$ = Rayleigh-Jeans brightness temperature, $4\pi I$ = flux, $\Delta \upsilon$ = line width, $T_{\rm ex}$ = excitation temperature, $\tau$ = line-centre peak opacity; ^b from H₂O; ^c this work; ^d Ungerechts et al. (1986); ^e Minchin et al. (1993); ^f Snell et al. (1984a); ^g Plume et al. (1994); ^h Emery et al. (1996).

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