We present 1.4-mm BIMA observations with subarcsecond resolution of the bright dust and molecular line emission from hot cores associated with a sample of four ultracompact HII regions: G9.62+0.19, G10.47-0.03, G29.96-0.02, G31.41+0.31. Density power laws can reproduce the observed continuum emission but break down on scales smaller than 2000 AU. A total of 38 transitions from 18 species are detected, with G10.47 and G31.41 showing the greatest number of lines. In particular, these sources display emission from two collisionally-excited transitions of methanol lying more than 950 K above the ground state. Outflows traced by H2S emission provide evidence for embedded exciting sources and the observed morphology of molecular lines is consistent with internal heating of the cores.
@article{arxiv.astro-ph/0211654,
title = {Subarcsecond Imaging of Hot Cores with BIMA},
author = {A. G. Gibb and F. Wyrowski and L. G. Mundy},
journal= {arXiv preprint arXiv:astro-ph/0211654},
year = {2007}
}
Comments
6 pages, 3 figures (2 colour). To be published in the proceedings of `Chemistry as a Diagnostic of Star Formation', eds C.L. Curry & M. Fich. Uses sfchem.cls. Full-resolution figures available at http://www.astro.umd.edu/~agg/research/SFChem2002