Gas-phase SO 2 in absorption towards massive protostars

Details Gas-phase SO 2 in absorption towards massive protostars Gas-phase SO 2 in absorption towards massive protostars

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376l...5k&link_type=abstract

Astronomy and Astrophysics, v.376, p.L5-L8 (2001)

Astronomy and Astrophysics

Astrophysics

16

Star-Formation: Gas-Phase Molecules, Ism: Abundances, Ism: Molecules

Scientific paper

We present the first detection of the nu3 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. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.

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