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26 April 2024 |
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Submillimeter Array 440$mu$m/690GHz line and continuum observations of Orion-KL | | H. Beuther
; Q. Zhang
; M.J. Reid
; T.R. Hunter
; M. Gurwell
; D. Wilner
; J.-H. Zhao
; H. Shinnaga
; E. Keto
; P.T.P. Ho
; J.M. Moran
; S.-Y. Liu
; | | Date: |
26 Sep 2005 | | Subject: | astro-ph | | 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. | | Source: | arXiv, astro-ph/0509771 | | Services: | Forum | Review | PDF | Favorites | |
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