Detection of Interstellar Acetone Toward the Orion-KL Hot Core

Details Detection of Interstellar Acetone Toward the Orion-KL Hot Core Detection of Interstellar Acetone Toward the Orion-KL Hot Core

2005-09-14

arxiv.org/abs/astro-ph/0509409v1

Astrophys.J.632:L95-L98,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 1 table, 3 figures to be published in The Astrophysical Journal Letters

Scientific paper

10.1086/497986

We present the first detection of interstellar acetone [(CH3)2CO] toward the high mass star forming region Orion-KL and the first detection of vibrationally excited (CH3)2CO in the ISM. Using the BIMA Array, 28 emission features that can be assigned to 54 acetone transitions were detected. Furthermore, 37 of these transitions have not been previously observed in the ISM. The observations also show that the acetone emission is concentrated toward the hot core region of Orion-KL, contrary to the distribution of other large oxygen bearing molecules. From our rotational-temperature diagram we find a beam averaged (CH3)2CO column density of (2.0(0.3)-8.0(1.2))x10^16 cm^-2 and a rotational temperature of 176(48)-194(66) K.

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