Kinematics of a Hot Massive Accretion Disk Candidate
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,...
| Main Authors: | , |
|---|---|
| Format: | Journal Article |
| Published: |
Institute of Physics Publishing
2008
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/18769 |
| _version_ | 1848749840021848064 |
|---|---|
| author | Beuther, H. Walsh, Andrew |
| author_facet | Beuther, H. Walsh, Andrew |
| author_sort | Beuther, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. Resorting Query Results <a href="http://adsabs.harvard.edu/cgi-bin/nph-abs_connect">http://adsabs.harvard.edu/cgi-bin/nph-abs_connect</a> 73 |
| first_indexed | 2025-11-14T07:27:19Z |
| format | Journal Article |
| id | curtin-20.500.11937-18769 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:27:19Z |
| publishDate | 2008 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-187692017-02-28T01:35:23Z Kinematics of a Hot Massive Accretion Disk Candidate Beuther, H. Walsh, Andrew stars: individual (IRAS 18089-1732) Stars: Early-Type Stars: Formation 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. Resorting Query Results <a href="http://adsabs.harvard.edu/cgi-bin/nph-abs_connect">http://adsabs.harvard.edu/cgi-bin/nph-abs_connect</a> 73 2008 Journal Article http://hdl.handle.net/20.500.11937/18769 Institute of Physics Publishing restricted |
| spellingShingle | stars: individual (IRAS 18089-1732) Stars: Early-Type Stars: Formation Beuther, H. Walsh, Andrew Kinematics of a Hot Massive Accretion Disk Candidate |
| title | Kinematics of a Hot Massive Accretion Disk Candidate |
| title_full | Kinematics of a Hot Massive Accretion Disk Candidate |
| title_fullStr | Kinematics of a Hot Massive Accretion Disk Candidate |
| title_full_unstemmed | Kinematics of a Hot Massive Accretion Disk Candidate |
| title_short | Kinematics of a Hot Massive Accretion Disk Candidate |
| title_sort | kinematics of a hot massive accretion disk candidate |
| topic | stars: individual (IRAS 18089-1732) Stars: Early-Type Stars: Formation |
| url | http://hdl.handle.net/20.500.11937/18769 |