Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.284p&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
The formation of intermediate/high-mass stars is currently a matter of vigorous debate. On one hand, many authors suggest the possibility that massive stars form as a scaled-up version of low-mass stars, thus driving collimated outflows and being associated with rotating accretion disks. On the other hand, the fact that massive stars are found associated with clusters leads to consider the possibility that a cluster could be a requirement for massive star formation. This last property (clustered environments) together with the large distances where massive stars are located make their study challenging and requiring high angular resolution observations. We present a study of four regions forming intermediate/high-mass protostars driving outflows and (two of them) with hot core emission. The four regions were observed at 1 mm using the Plateau de Bure Interferometer in its most extended configuration, reaching angular resolutions of 0.4''. These observations allowed us to study: 1) the millimeter continuum emission down to mass sensitivities of 0.1 Msun, likely tracing the disk in some cases, and dust entrained by the outflow(s) in other cases; 2) the outflow emission as revealed by CO(2-1), tracing the walls of the outflow cavities and/or knots of high-velocity emission; and 3) the hot core emission for two of the regions with an exceptional spatial resolution of 300--700 AU. The hot core emission for one of the sources reveals a velocity gradient, possibly indicating rotation, while the other hot core source splits up into two hot core components with slightly different velocities, possibly forming a binary system fragmented from a rotating core. We will show a first analysis and discussion of these results, which constitute an excellent preparatory step for future ALMA observations.
Alonso-Albi Tomas
Audard Marc
Boissier Jérémie
Busquet Gemma
Estalella Robert
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