High-resolution EVLA image of dimethyl ether (CH${}_3$)${}_2$O in Orion--KL

Abstract

We report the first sub-arc second (0.65$\arcsec$ $\times$ 0.51$\arcsec$) image of the dimethyl ether molecule, (CH${}_3$)${}_2$O, toward the Orion Kleinmann-Low nebula (Orion--KL). The observations were carried at 43.4 GHz with the Expanded Very Large Array (EVLA). The distribution of the lower energy transition 6${}_{1,5}-6_{0,6}$, EE (E${}_{\mathrm{u}}$ = 21 K) mapped in this study is in excellent agreement with the published dimethyl ether emission maps imaged with a lower resolution. The main emission peaks are observed toward the Compact Ridge and Hot Core southwest components, at the northern parts of the Compact Ridge and in an intermediate position between the Compact Ridge and the Hot Core. A notable result is that the distribution of dimethyl ether is very similar to that of another important larger O-bearing species, the methyl formate (HCOOCH${}_3$), imaged at lower resolution. Our study shows that higher spectral resolution (WIDAR correlator) and increased spectral coverage provided by the EVLA offer new possibilities for imaging complex molecular species. The sensitivity improvement and the other EVLA improvements make this instrument well suited for high sensitivity, high angular resolution, molecular line imaging.

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Cited by in corpus (10)

• CH3OCH3 in Orion-KL: a striking similarity with HCOOCH3
• Chemical segregation of complex organic O-bearing species in Orion KL
• Compression of interferometric radio-astronomical data
• Acetone in Orion BN/KL - High-resolution maps of a special oxygen-bearing molecule
• Intermediate-mass hot cores at 500 AU: disks or outflows?
• A 3D view of the outflow in the Orion Molecular Cloud 1 (OMC-1)
• ALMA observations of the archetypal "hot core" that isn't: Orion KL
• Infrared action spectroscopy as tool for probing gas-phase dynamics: Protonated Dimethyl Ether, (CH${}_3$)${}_2$OH${}^{+}$, formed by the reaction of CH${}_3$OH${}_2^{+}$ with CH${}_3$OH
• The distribution of deuterated formaldehyde within Orion-KL
• CARMA $\lambda$ = 1 cm Spectral Line Survey of Orion-KL