Fine Structure of Star Formation Region in Orion KL

Details Fine Structure of Star Formation Region in Orion KL Fine Structure of Star Formation Region in Orion KL

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402..372m&link_type=abstract

Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o

Astronomy and Astrophysics

Astrophysics

Scientific paper

A star formation region in Orion KL is studied in H2O maser emission. The structure consists of an accretion disk, a bipolar outflow, and an envelope. The disk is divided into rings with a rotation velocity vrot ≃ Ω R, period T ≃ 170 yr. The kinetic energy of rotation transforms into the bipolar outflow v˜ 10 km/s. The reactive force leads to two-mode precession and forms the outflow of a helix structure with a curved axis. The disk is the accreted environment in the azimuth plane and is ejected along the rotation axis like vortexes. A shell amplifies emission more than two orders at V=7.65 km/s. The ejector size is ≤ 50 μas, and the brightness temperature Tb≥1017K.

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