2013A&A...554A..78P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:32:07

2013A&A...554A..78P - Astronomy and Astrophysics, volume 554A, 78-78 (2013/6-1)

Acetone in Orion BN/KL . High-resolution maps of a special oxygen-bearing molecule.

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

Abstract (from CDS):

As one of the prime targets of interstellar chemistry study, Orion BN/KL clearly shows different molecular distributions between large nitrogen- (e.g., C2H5CN) and oxygen-bearing (e.g., HCOOCH3) molecules. However, acetone (CH3)2CO, a special complex O-bearing molecule, has been shown to have a very different distribution from other typical O-bearing molecules in the BN/KL region. Therefore, it is worth investigating acetone in detail at high angular resolutions, which will help us understand the formation of this molecule and its chemical role in the complex BN/KL region. We searched for acetone within our IRAM Plateau de Bure Interferometer 3mm and 1.3mm data sets. Twenty-two acetone lines were searched within these data sets. The angular resolution ranged from 1.8"x0.8" to 6.0"x2.3", and the spectral resolution ranged from 0.4 to 1.9km/s. Nine of the acetone lines appear free of contamination. Three main acetone peaks (Ace-1, 2, and 3) are identified in Orion BN/KL. The new acetone source Ace-3 and the extended emission in the north of the hot core region have been found for the first time. An excitation temperature of about 150K is determined toward Ace-1 and Ace-2, and the acetone column density is estimated to be 2-4x1016cm–2 with a relative abundance of 1-6x10–8 toward these two peaks. Acetone is a few times less abundant toward the hot core and Ace-3 compared with Ace-1 and Ace-2. We find that the overall distribution of acetone in BN/KL is similar to that of N-bearing molecules, e.g., NH3 and C2H5CN, and very different from those of large O-bearing molecules, e.g., HCOOCH3 and (CH3)2O. Our findings show the acetone distribution is more extended than in previous studies and does not originate only in those areas where both N-bearing and O-bearing species are present. Moreover, because the N-bearing molecules may be associated with shocked gas in Orion BN/KL, this suggests that the formation and/or destruction of acetone may involve ammonia or large N-bearing molecules in a shocked-gas environment.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - astrochemistry - submillimeter: ISM

Simbad objects: 24

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Number of rows : 24

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 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1065 3
2 4C -02.19 QSO 05 01 12.80988366 -01 59 14.2562534   19.1 18.4 19.04   ~ 521 1
3 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 884 1
4 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1024 2
5 [FDB2011] MF5 mm 05 35 14.12 -05 22 27.7           ~ 5 0
6 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2025 1
7 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
8 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 59 0
9 [CW97] 4 PoC 05 35 14.24 -05 22 37.8           ~ 2 0
10 [CW97] 5 PoC 05 35 14.27 -05 22 30.9           ~ 2 0
11 MLLA 610 IR 05 35 14.278 -05 22 30.65           ~ 70 0
12 COUP 621 Y*O 05 35 14.35371 -05 22 32.8820           ~ 104 0
13 [FDB2011] MF2 mm 05 35 14.44 -05 22 34.4           ~ 6 0
14 [CW97] 3 PoC 05 35 14.46 -05 22 35.0           ~ 2 0
15 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 47 0
16 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 176 0
17 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 580 1
18 [CW97] 1 PoC 05 35 14.59 -05 22 30.8           ~ 2 0
19 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 865 1
20 QSO B0605-0834 QSO 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 398 1
21 QSO B0607-157 QSO 06 09 40.9477650070 -15 42 40.649794982   18.47 18.0 19.90   ~ 290 1
22 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 532 1
23 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1943 1
24 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 113 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:32:07

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