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Paper: Maser H2O Outbursts and Bullets in Orion KL
Volume: 402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page: 366
Authors: Demichev, V.; Matveyenko, L.I.; Graham, D.A.; Diamond, P.J.
Abstract: We studied the structure of the H2O super maser region in Orion with VLBI angular resolution 0.1 mas or 0.05 AU. High activity was accompanied by powerful outbursts (F∼8MJy) and the ejection of bullets. The bullets are concentrated in a narrow angle ≤ 10° on distances to 80 AU, moving with velocities 10-20 km/s. They have elongated ∼1-5 AU structure, sometimes comet-like or head-tail shape with brightness temperatures reaching Tb ∼ 1013 K. The bullets are fragments of the outflow. The maser emission is determined by collisions with surrounding medium. The visibility time of bullets is short—several months.
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