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Aperture synthesis observations of Orion-KL in CS lines and 3mm continuum

  • Y. Murata (a1), R. Kawabe (a2), M. Ishiguro (a2), T. Hasegawa (a3) and M. Hayashi (a1)...

Abstract

We have made aperture synthesis maps toward the Orion-KL nebula in CS(1-0), CS(2-1) and 3mm continuum with the Nobeyama Millimeter Array (NMA). The CS(1-0) maps were obtained across the central 2′ region of the Orion-KL nebula. Our maps show the rotating disk around the KL nebula with the diameter of 0.3 pc and the mass of 25 M. The disk clearly shows the Keplerian rotation, which indicates that the mass of the KL nebula is 100 — 150 M. The shell structure around the molecular outflow is also found in CS(1-0) map. This structure also appears in CS(2-1) map.

From 3mm continuum map, we have found at least six continuum sources. One of them is f-f emission from the ultra-compact HII region around BN. Other sources are the dust clumps whose masses are estimated to be 1 — 4 M. The distribution of the dust clumps shows clear anti-correlation with the 20 μm emissions. This indicates that the 20 μm emissions are obscured by these dust clumps.

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Copyright

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