Statistics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..409g&link_type=abstract
The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460
Statistics
Stars: Formation, Ism:Jets And Outflows
Scientific paper
We have conducted with ISO-LWS a study of the far infrared line emission of a sample of 17 Class 0 objects and their associated outflows. At variance with more evolved young stars, such as Class I and pre-main sequence stars, the investigated spectra show a copious molecular emission in form of CO, H2O and, to a minor extent, OH transitions. Our analysis demonstrates that the bulk of the emission arises from very small, dense and warm regions, where the ambient gas is heated by non-dissociative shocks, associated with the high energetic outflows characterizing this early phase of the star formation. Wherever gas phase water has been observed, large abundances are commonly estimated, with values which appear to be correlated with the gas temperature. OI, CO and H2O contribute rough equally the whole line luminosity, indicating that a strongly prevailing cooling channel does not exist. These results are however still not conclusive, given the poor statistics and the large uncertainties associated with the water abundance determinations. In this contribution we will show how the FIRST instrumental capabilities are well suited to put firm conclusions on these questions.
Giannini Teresa
Lorenzetti Dario
Nisini Brunella
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