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 Kinematics of a hot massive accretion disk candidate


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Characterizing rotation, infall and accretion disks around high-mass protostars is an important topic in massive star formation research. With the Australia Telescope Compact Array and the Very Large Array we studied a massive disk candidate at high angular resolution in ammonia NH34,4 & 5,5 tracing the warm disk but not the envelope. The observations resolved at ~0.4 resolution corresponding to ~1400AU a velocity gradient indicative of rotation perpendicular to the molecular outflow. Assuming a Keplerian accretion disk, the estimated protostar-disk mass would be high, similar to the protostellar mass. Furthermore, the position-velocity diagram exhibits additional deviation from a Keplerian rotation profile which may be caused by infalling gas and-or a self-gravitating disk. Moreover, a large fraction of the rotating gas is at temperatures 100K, markedly different to typical low-mass accretion disks. In addition, we resolve a central double-lobe cm continuum structure perpendicular to the rotation. We identify this with an ionized, optically thick jet.



Autor: H. Beuther; A. Walsh

Fuente: https://archive.org/







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