Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.241l&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Some theoretical models propose that O-B stars form via accretion, in a similar fashion to low-mass stars. Jet-driven molecular outflows play an important role in this scenario, and their study can help to understand the process of high-mass star formation and the different evolutionary phases involved. Observations towards low-mass protostars so far favour an evolutionary picture in which jets are always associated with Class 0 objects while more evolved Class I/II objects show less evidence of powerful jets. The study presented here has aimed at checking whether an analogous picture can be found in the high-mass case. For this purpose, a sample of 57 high-mass molecular clumps in different evolutionary stages has been observed in the SiO(2--1) and (3--2) transitions with the IRAM 30-m telescope (Spain). SiO emission at high velocities, characteristic of molecular jets, is detected in 88% of our sources, a very high detection rate indicating that there is ongoing star formation activity in most of the sources of our sample. The most remarkable finding is an SiO(2--1) luminosity decay with the ratio of bolometric luminosity to mass of the clump, Lbol/M, which suggests that jet activity declines as time evolves. This result represents the first clear evidence of a decrease of SiO outflow luminosity with time in a homogeneous sample of high-mass molecular clumps in different evolutionary stages. The SiO(3--2) to SiO(2--1) integrated intensity ratio shows only minor changes with evolutionary state.
Bronfman Leonard
Carey Sean Joseph
Cesaroni Riccardo
Codella Claudio
López-Sepulcre Ana
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