CH3OCH3 in Orion-KL: a striking similarity with HCOOCH3

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Table 5

Dimethyl ether and methyl formate parameters from previous single-dish studies.

Authors	Telescope	Beam	Frequency	Dimethyl ether		Methyl formate		R ^a	Comment
				T _rot	N	T _rot	N
		(″)	(GHz)	(K)	(10¹⁶ cm^-2)	(K)	(10¹⁶ cm^-2)

Goddi et al. (2009)	GBT	16	43	88	5.8			1.07	^b
Johansson et al. (1984)	Onsala 20 m	47	72−90	75	0.25	25−90	0.05−0.25	1.02
Turner (1991)	NRAO 11 m	83	75−115	91	0.13	62	0.66	1.66	^c
Lee & Cho (2002)	TRAO 14 m	46	138−164	130−360	0.5−3.6	55−120	0.6−4.4	2−14
Remijan et al. (2008)	NRAO 12 m	43	130−170	75	0.6			2.05
Ziurys & McGonagle (1993)	FCRAO 14 m	40	150−160	109	0.3	52	0.077	0.89
Blake et al. (1987)	OVRO 10.4 m	30	215−263	63 ± 5	0.3	90 ± 10	0.26	0.50
Sutton et al. (1995)	JCMT	14	334−343	75	1.49	105	2.45	0.54	^d
Schilke et al. (1997)	CSO	20	325−360	89 ± 5	1.8	98 ± 3	1.5	1.33
Schilke et al. (2001)	CSO	11	607−725	360	3	316	13	0.67
Comito et al. (2005)	CSO	11	795−903	160	2			0.45
Persson et al. (2007)	Odin satellite	2.1′	486−492/541−577	112	13			0.73	^e
This paper^f	PdBI	30	101/203/223	90	0.6			1	^f

Notes.

^(a)

Normalized number of dimethyl ether molecules, see Sect. 5.1.2.

^(b)

Assuming a 10″ source size.

^(c)

a second cooler (T_rot = 22 K) component is seen in MF only with a lower column density (2.7 × 10¹⁴).

^(d)

Compact Ridge position.

^(e)

Adopted source size 5–6″.

^(f)

Our PdBI data convolved to a field of view of 30″.

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