Abstract
We nave made aperture synthesis maps toward the Orion-KL nebula in CS(l-0), CS(2-1) and 3mm continuum with the Nobeyama Millimeter Array (NMA). The CS(l-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(l-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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have