Volume 376, Number 1, September II 2001
|Page(s)||L5 - L8|
|Published online||15 September 2001|
Gas-phase SO in absorption towards massive protostars*
Kapteyn Institute, PO Box 800, 9700 AV Groningen, The Netherlands
2 Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
3 SRON, PO Box 800, 9700 AV Groningen, The Netherlands
Corresponding author: J. V. Keane, email@example.com
Accepted: 11 July 2001
We present the first detection of the ro-vibrational band of gas-phase in absorption in the mid-infrared spectral region around 7.3 of a sample of deeply embedded massive protostars. Comparison with model spectra shows that the derived excitation temperatures correlate with previous C2H2 and HCN studies, indicating that the same warm gas component is probed. The column densities are similar along all lines of sight suggesting that the formation has saturated, but not destroyed, and the absolute abundances of are high (~10-7). Both the high temperature and the high abundance of the detected are not easily explained by standard hot core chemistry models. Likewise, indicators of shock induced chemistry are lacking.
Key words: stars: formation / ISM: abundances / ISM: molecules
© ESO, 2001
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