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20 April 2024 |
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Article overview
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CH3OCH3 in Orion-KL: a striking similarity with HCOOCH3 | | N. Brouillet
; D. Despois
; A. Baudry
; T.-C. Peng
; C. Favre
; A. Wootten
; A. J. Remijan
; T. L. Wilson
; F. Combes
; G. Wlodarczak
; | | Date: |
18 Dec 2012 | | Abstract: | We used several data sets from the Plateau de Bure Interferometer to map the
dimethyl ether emission in Orion-KL with different arcsec spatial resolutions
and different energy levels to compare with our previous methyl formate maps.
Our data show remarkable similarity between the dimethyl ether (CH3OCH3) and
the methyl formate (HCOOCH3) distributions even on a small scale (1.8"x0.8" or
about 500 AU). This long suspected similarity, seen from both observational and
theoretical arguments, is demonstrated with unprecedented confidence, with a
correlation coefficient of maps of 0.8.
A common precursor is the simplest explanation of our correlation.
Comparisons with previous laboratory work and chemical models suggest the major
role of grain surface chemistry and a recent release, probably with little
processing, of mantle molecules by shocks. In this case the CH3O radical
produced from methanol ice would be the common precursor (whereas ethanol,
C2H5OH, is produced from the radical CH2OH). The alternative gas phase scheme,
where protonated methanol CH3OH2+ is the common precursor to produce methyl
formate and dimethyl ether through reactions with HCOOH and CH3OH, is also
compatible with our data. Our observations cannot yet definitely allow a choice
between the different chemical processes, but the tight correlation between the
distributions of HCOOCH3 and CH3OCH3 strongly contrasts with the different
behavior we observe for the distributions of ethanol and formic acid. This
provides a very significant constraint on models. | | Source: | arXiv, 1212.4531 | | Services: | Forum | Review | PDF | Favorites | |
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