Submillimeter Array 440$\mu$m/690GHz line and continuum observations of Orion-KL
Abstract
Submillimeter Array observations of Orion-KL at 1'' resolution in the 440mu/690GHz band reveal new insights about the continuum and line emission of the region. The 440mu continuum flux density measurement from source I allows us to differentiate among the various proposed physical models: Source I can be well modeled by a ``normal'' protostellar SED consisting of a proton-electron free-free emission component at low frequencies and a strong dust component in the submillimeter bands. Furthermore, we find that the protostellar object SMA1 is clearly distinct from the hot core. The non-detection of SMA1 at cm and infrared wavelengths suggests that it may be one of the youngest sources in the entire Orion-KL region. The molecular line maps show emission mainly from the sources I, SMA1 and the hot core peak position. An analysis of the CH$3CN(37_K-36_K) K-ladder (K=0...3) indicates a warm gas component of the order 600+-200K. In addition, we detect a large fraction (~58%) of unidentified lines and discuss the difficulties of line identifications at these frequencies.
Cite
@article{arxiv.astro-ph/0509771,
title = {Submillimeter Array 440$\mu$m/690GHz line and continuum observations of Orion-KL},
author = {H. Beuther and Q. Zhang and M. J. Reid and T. R. Hunter and M. Gurwell and D. Wilner and J. -H. Zhao and H. Shinnaga and E. Keto and P. T. P. Ho and J. M. Moran and S. -Y. Liu},
journal= {arXiv preprint arXiv:astro-ph/0509771},
year = {2016}
}
Comments
13 pages, 8 figures, accepted for ApJ, sched. v.636 January 2006, higher resolution version available at http://www.mpia-hd.mpg.de/homes/beuther