2015A&A...582L...1T


Query : 2015A&A...582L...1T

2015A&A...582L...1T - Astronomy and Astrophysics, volume 582, L1-1 (2015/10-1)

Searching for trans ethyl methyl ether in Orion KL.

TERCERO B., CERNICHARO J., LOPEZ A., BROUILLET N., KOLESNIKOVA L., MOTIYENKO R.A., MARGULES L., ALONSO J.L. and GUILLEMIN J.-C.

Abstract (from CDS):

We report on the tentative detection of trans ethyl methyl ether (tEME), t-CH3CH2OCH3, through the identification of a large number of rotational lines from each one of the spin states of the molecule towards Orion KL. We also search for gauche-trans-n-propanol, Gt-n-CH3CH2CH2OH, an isomer of tEME in the same source. We have identified lines of both species in the IRAM 30 m line survey and in the ALMA Science Verification data. We have obtained ALMA maps to establish the spatial distribution of these species. Whereas tEME mainly arises from the compact ridge component of Orion, Gt-n-propanol appears at the emission peak of ethanol (south hot core). The derived column densities of these species at the location of their emission peaks are ≤(4.0±0.8)x1015cm–2 and ≤(1.0±0.2)x1015cm–2 for tEME and Gt-n-propanol, respectively. The rotational temperature is ∼100K for both molecules. We also provide maps of CH3OCOH, CH3CH2OCOH, CH3OCH3, CH3OH, and CH3CH2OH to compare the distribution of these organic saturated O-bearing species containing methyl and ethyl groups in this region. Abundance ratios of related species and upper limits to the abundances of non-detected ethers are provided. We derive an abundance ratio N(CH3OCH3)/N(tEME)≥150 in the compact ridge of Orion.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: individual objects: Orion KL - ISM: molecules - radio lines: ISM - surveys

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2207 1
2 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 618 1
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2148 1
4 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 123 0
5 W 51e1 HII 19 23 43.785 +14 30 26.11           ~ 128 0
6 W 51e2 PCG 19 23 43.906 +14 30 34.48           ~ 204 0
7 W 51 SNR 19 23 50 +14 06.0           ~ 1242 1

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2023.02.01-05:58:27

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