NGC7538 Irs1 N: Modeling a Circumstellar Maser Disk |
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| Authors: | M Pestalozzi M Elitzur J Conway R Booth |
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| Institution: | (1) Onsala Space Observatory, Onsala, Sweden;(2) Department of Physics and Astronomy, University of Kentucky, Lexington, KY, USA |
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| Abstract: | We present an edge-on Keplerian disk model to explain the main component of the 12.2 and 6.7 GHz methanol maser emission detected toward NGC7538-IRS1N. The brightness distribution and spectrum of the line of bright masers are successfully modeled with high amplification of background radio continuum emission along velocity coherent paths through a maser disk. The bend seen in the position–velocity diagram is a characteristic signature of differentially rotating disks. For a central mass of 30M , suggested by other observations, our model fixes the masing disk to have inner and outer radii of  270 and 750 AU. |
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| Keywords: | Masers: Star formation |
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