Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-26
Astrophys.J.636:323-331,2005
Astronomy and Astrophysics
Astrophysics
13 pages, 8 figures, accepted for ApJ, sched. v.636 January 2006, higher resolution version available at http://www.mpia-hd.mp
Scientific paper
10.1086/498015
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.
Beuther Henrick
Gurwell Mark
Ho Paul T. P.
Hunter Todd Russell
Keto Eric
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