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Issue A&A Volume 414, Number 2, February I 2004 Page(s) 409 - 423 Section Cosmology DOI 10.1051/0004-6361:20031646

A&A 414, 409-423 (2004)
DOI: 10.1051/0004-6361:20031646

The physical and chemical structure of hot molecular cores

H. Nomura and T. J. Millar

Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK
    e-mail: tom.millar@umist.ac.uk
(Received 21 July 2003/ Accepted 21 October 2003 )

Abstract
We have made self-consistent models of the density and temperature profiles of the gas and dust surrounding embedded luminous objects using a detailed radiative transfer model together with observations of the spectral energy distribution of hot molecular cores. Using these profiles we have investigated the hot core chemistry which results when grain mantles are evaporated, taking into account the different binding energies of the mantle molecules, as well a model in which we assume that all molecules are embedded in water ice and have a common binding energy. We find that most of the resulting column densities are consistent with those observed toward the hot core G34.3+0.15 at a time around 10 ⁴ years after central luminous star formation. We have also investigated the dependence of the chemical structure on the density profile which suggests an observational possibility of constraining density profiles from determination of the source sizes of line emission from desorbed molecules.

Key words: molecular processes -- radiative transfer -- stars: formation -- ISM: individual objects: G34.3+0.15

Offprint request: H. Nomura, h.nomura@umist.ac.uk

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