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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 paperf 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 (Trot = 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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