Structure and chemistry in the hot molecular core G34.3+0.15

Macdonald, G.H. and Habing, R.J. and Millar, T.J. (1995) Structure and chemistry in the hot molecular core G34.3+0.15. Astrophysics and Space Science , 224 (1-2). pp. 177-180. ISSN 0004-640X . (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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New multifrequency spatial and spectral studies of the hot molecular core associated with the ultracompact HII region G34.3+0.15 have demonstrated an extremely rich chemistry in this archetypal hot core and revealed differing spatial structure between certain species which may be a dynamical effect of chemical evolution. The structure of the hot core has been studied with the JCMT in the high excitation 5=19-18 and J=18-17 lines of CH3CN and with the Nobeyama Millimetre Array at 4'' are resolution in the J=6-5 transition. Comparison with a VLA NH3(3,3) map shows a displacement between peak emission in the two chemical species which is consistent with chemical processing on a time scale comparable to the dynamical time scale of similar or equal to 10(5) yrs. A 330-360 GHz spectral survey of the hot core with the JCMT has detected 358 spectral lines from at least 46 distinct chemical species, including many typical of shocked chemistry while other species indicate abundances that reflect the chemistry of a previous cold phase. The first unambiguous detection of ethanol in hot gas has been made. Observations of 14 rotational transitions of this molecule yield a temperature of 125 K and column density similar or equal to 2x10(15) cm(-2). This large abundance cannot be made by purely gas-phase processes and it is concluded that ethanol must have formed by grain surface chemistry.

Item Type: Article
Additional information: Document Type: Proceedings Paper
Uncontrolled keywords: molecular processes; ism-clouds; gas, molecules
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: O.O. Odanye
Date Deposited: 04 Jun 2009 13:22
Last Modified: 08 May 2012 10:48
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