2008ApJ...673L..55B -
Astrophys. J., 673, L55-L58 (2008/January-3)
Kinematics of a hot massive accretion disk candidate.
BEUTHER H. and WALSH A.J.
Abstract (from CDS):
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 [NH3(4, 4) and (5, 5)] tracing the warm disk but not the envelope. The observations resolved at ∼0.4" resolution (corresponding to ∼1400 AU) 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 that may be caused by infalling gas and/or a self-gravitating disk. Moreover, a large fraction of the rotating gas is at temperatures >100 K, markedly different from typical low-mass accretion disks. In addition, we resolve a central double-lobe centimeter continuum structure perpendicular to the rotation. We identify this with an ionized, optically thick jet.
Abstract Copyright:
∼
Journal keyword(s):
Stars: Early-Type - Stars: Formation - stars: individual (IRAS 18089-1732)
Simbad objects:
1
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2008ApJ...673L..55B and select 'bookmark this link' or equivalent in the popup menu