SIMBAD references

2001A&A...376L...5K - Astronomy and Astrophysics, volume 376, L5-8 (2001/9-2)

Gas-phase SO2 in absorption towards massive protostars.

KEANE J.V., BOONMAN A.M.S., TIELENS A.G.G.M. and VAN DISHOECK E.F.

Abstract (from CDS):

We present the first detection of the nu ro-vibrational band of gas-phase SO2 in absorption in the mid-infrared spectral region around 7.3µm 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 SO2 column densities are similar along all lines of sight suggesting that the SO2 formation has saturated, but not destroyed, and the absolute abundances of SO2 are high (∼10–7). Both the high temperature and the high abundance of the detected SO2 are not easily explained by standard hot core chemistry models. Likewise, indicators of shock induced chemistry are lacking.

Abstract Copyright:

Journal keyword(s): star-formation: gas-phase molecules - ISM: abundances - ISM: molecules

Simbad objects: 9

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