Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..100m&link_type=abstract
Astronomy Letters, vol. 30, p. 100-116 (2004)
Astronomy and Astrophysics
Astronomy
9
Scientific paper
During the period 1979-1999, we investigated the hyperfine structure of the H_2O supermaser region located in the core of the molecular cloud OMC-1 in Orion KL. The angular resolution is 0.1 mas, which corresponds to 0.045 AU. The detected structure, which consists of a central object, an accretion disk, a bipolar outflow, and an envelope, corresponds to the initial formation stage of a low-mass star. The accretion disk is at the stage of separation into groups of concentric rings. The bipolar outflow is a neutral, highly collimated jet of accreted material that includes H_2O molecules and dust grains in the icy envelope. The injector is a bright compact source with a size < 0.05 AU and a brightness temperature T_b 10^{17} K. The velocity of the bipolar outflow is v 10 km/s. The rotation velocity of the jet is v_rot 1.5 km/s. The jet has the shape of a conical helix due to the precession of the rotation axis. Occasionally, dense blobs (comet-shaped bullets) are ejected. The envelope amplifies the radio emission from the structures in a 0.5 km/s maser window band with velocities v 7.65 km/s by more than two orders of magnitude.
Diamond Phil J.
Gram D. A.
Matveyenko L. I.
Zhakharin K. M.
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