Probing the Dynamical Evolution of Orion Sources on 10-100 AU Scales using SiO Masers

Details Probing the Dynamical Evolution of Orion Sources on 10-100 AU Scales using SiO Masers Probing the Dynamical Evolution of Orion Sources on 10-100 AU Scales using SiO Masers

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confq..26g&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 26-26"

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Scientific paper

A comprehensive picture of high-mass star formation has remained elusive, in part because examples of high-mass YSOs tend to be relatively distant, deeply embedded, and confused with other emission sources. These factors have impeded dynamical investigations within tens of AU of high-mass YSOs-scales that are critical for probing the interfaces where outflows from accretion disks are launched and collimated. Using VLA and VLBA observations of H_{2}O and SiO masers, the KaLYPSO project (http://www.cfa.harvard.edu/kalypso/) is overcoming these limitations by mapping the structure and dynamical/temporal evolution of the material 10-1000 AU from the nearest high-mass YSO: Radio Source I in the Orion BN/KL region. Our data include multiple ( 40) epochs of observations over a several-year period, allowing us to track the proper motions of individual SiO maser spots and to monitor changes in the physical conditions of the emitting material with time. Ultimately these data will provide 3-D maps of the outflow structure over approximately 30% of the outflow crossing time. These maps in turn will supply unprecedented new constraints on the mechanisms (e.g., magnetic fields) that are shaping the evolution of this high-mass YSO. I will summarize recent results from the KaLYPSO project, including compelling evidence that high-mass star formation is occurring via disk-mediated accretion. I will then discuss how the frequencies and spatial scales accessible with ALMA will provide provide complementary insight into the process of high-mass star formation in Orion and other high-mass star-forming regions.

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