2013A&A...550A..46B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:59:00

2013A&A...550A..46B - Astronomy and Astrophysics, volume 550A, 46-46 (2013/2-1)

CH3OCH3 in Orion-KL: a striking similarity with HCOOCH3.

BROUILLET N., DESPOIS D., BAUDRY A., PENG T.-C., FAVRE C., WOOTTEN A., REMIJAN A.J., WILSON T.L., COMBES F. and WLODARCZAK G.

Abstract (from CDS):

Orion-KL is a remarkable, nearby star-forming region where a recent explosive event has generated shocks that could have released complex molecules from the grain mantles. A comparison of the distribution of the different complex molecules will help in understanding their formation and constraining the chemical models. We used several data sets from the Plateau de Bure Interferometer to map the dimethyl ether emission with different arcsec spatial resolutions and different energy levels (from Eup=18 to 330K) 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 ∼500AU). This long suspected similarity, seen from both observational and theoretical arguments, is demonstrated with unprecedented confidence, with a correlation coefficient of maps ∼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 CH3OH+2 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.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: molecules - radio lines: ISM - ISM: individual objects: Orion-KL

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [FW2011] J053513.988-052244.887 mm 05 35 13.988 -05 22 44.89           ~ 5 0
2 [FDB2011] MF28 mm 05 35 14.00 -05 22 35.3           ~ 3 0
3 NAME OMC 1 Cluster Cl* 05 35 14 -05 22.5           ~ 14 0
4 [FDB2011] MF1 mm 05 35 14.09 -05 22 36.7           ~ 4 0
5 [FDB2011] MF13 mm 05 35 14.09 -05 22 32.5           ~ 2 0
6 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 286 2
7 [FDB2011] MF5 mm 05 35 14.12 -05 22 27.7           ~ 5 0
8 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
9 [FDB2011] MF4 mm 05 35 14.15 -05 22 29.3           ~ 3 0
10 [FDB2011] MF14 mm 05 35 14.16 -05 22 37.0           ~ 3 0
11 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
12 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
13 [FDB2011] MF12 mm 05 35 14.18 -05 22 34.6           ~ 4 0
14 [FDB2011] MF3 mm 05 35 14.31 -05 22 37.2           ~ 2 0
15 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 103 0
16 [FDB2011] MF2 mm 05 35 14.44 -05 22 34.4           ~ 6 0
17 [FDB2011] MF6 mm 05 35 14.50 -05 22 32.6           ~ 4 0
18 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
19 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1466 1
20 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 480 0
21 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1035 1
22 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
23 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1909 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:59:01

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