The star-forming region in Orion KL |
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Authors: | L I Matveyenko K M Zakharin P J Diamond D A Graham |
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Institution: | (1) Space Research Institute, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia;(2) Nuffield Radio Observatory, Macclesfield, Cheshire, SK11, 9DL, UK;(3) Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany |
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Abstract: | We have studied the fine structure of the active H2O supermaser emission region in Orion KL with an angular resolution of 0.1 mas. We found central features suggestive of a bipolar outflow, bullets, and an envelope which correspond to the earliest stage of low-mass star formation. The ejector is a bright compact source ≤0.05 AU in size with a brightness temperature T b ?1017 K. The highly collimated bipolar outflow ~30 has a velocity v ej ?10 km s?1, a rotation period of ~0.5 yr, a precession period of ~10 yr, and a precession angle of ~33°. Precession gives rise to a jet in the shape of a conical helix. The envelope amplifies the radio emission from the components by about three orders of magnitude at a velocity v=7.65 km s?1. |
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Keywords: | star formation accretion disks maser emission |
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