Other
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..397n&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Other
2
Stars: Formation, Ism: Jets And Outflows, Ism: Molecules
Scientific paper
We present the observations of SiO transitions from J=2-1 (86.85 GHz) up to J=11-10 (477.50 GHz), obtained at IRAM and JCMT telescopes, of several high velocity bullets located along the jets of the low mass protostars L1448-mm and L1157-mm. Such observations, have been analysed to derive the physical conditions pertaining to these dense and compact condensations. The gas responsible for the SiO emission turns out to be not only very dense (n > 105 cm-3) but also warm, with temperatures larger than 300K for most of the bullets, which show different excitation conditions. Such high temperature reconciles the derived high SiO abundance with the presence of shocks strong enough to allow the release of silicon from the dust grains. Comparisons with other tracers of warm molecular shocked gas such as H2, high-J CO and H2O transitions observed by ISO are also discussed.
Bachiller Rafael
Codella Claudio
Garcia Santiago J.
Giannini Teresa
Nisini Brunella
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