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As one of the prime targets of interstellar chemistry study, Orion BN/KLclearly 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 verydifferent distribution from other typical O-bearing molecules in the BN/KLregion. We searched for acetone within our IRAM Plateau de Bure Interferometer3 mm and 1.3 mm data sets. Twenty-two acetone lines were searched within thesedata sets. The angular resolution ranged from 1.8 X 0.8 to 6.0 X 2.3 arcsec^2,and the spectral resolution ranged from 0.4 to 1.9 km s-1. Nine of the acetonelines 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 extendedemission in the north of the hot core region have been found for the firsttime. An excitation temperature of about 150 K is determined toward Ace-1 andAce-2, and the acetone column density is estimated to be 2-4 X 10^16 cm-2 witha relative abundance of 1-6 X 10^-8 toward these two peaks. Acetone is a fewtimes less abundant toward the hot core and Ace-3 compared with Ace-1 andAce-2.  We find that the overall distribution of acetone in BN/KL is similar to thatof N-bearing molecules, e.g., NH3 and C2H5CN, and very different from those oflarge O-bearing molecules, e.g., HCOOCH3 and (CH3)2O. Our findings show theacetone distribution is more extended than in previous studies and does notoriginate only in those areas where both N-bearing and O-bearing species arepresent. Moreover, because the N-bearing molecules may be associated withshocked gas in Orion BN/KL, this suggests that the formation and/or destructionof acetone may involve ammonia or large N-bearing molecules in a shocked-gasenvironment.

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