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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308842.0, MPI für Astronomie / Publikationen_mpia
Submillimeter Array 440 µm/690 GHz line and continuum observations of Orion KL
Authors:Beuther, H.; Zhang, Q.; Reid, M. J.; Hunter, T. R.; Gurwell, M.; Wilner, D.; Zhao, J. H.; Shinnaga, H.; Keto, E.; Ho, P. T. P.; Moran, J. M.; Liu, S. Y.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:323
End Page:331
Audience:Not Specified
Abstract / Description:Submillimeter Array observations of Orion KL at ~1" resolution in the 440 mum/690 GHz band reveal new insights about the continuum and line emission of the region. The 440 mum 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 spectral energy distribution (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 nondetection of SMA1 at centimeter 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 source I, SMA1, and the hot core peak position. An analysis of the CH3CN(37K-36K) K-ladder (K=0,...,3) indicates a warm gas component of the order of 600+/-200 K. In addition, we detect a large fraction (~58%) of unidentified lines and discuss the difficulties of line identification at these frequencies.
Free Keywords:ISM: individual (Orion KL); ISM: Lines and Bands; ISM: Molecules; Stars: Formation; Submillimeter; Techniques: Interferometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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