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NGC7538 Irs1 N: Modeling a Circumstellar Maser Disk

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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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Authors and Affiliations

  1. Onsala Space Observatory, Onsala, Sweden

    M. Pestalozzi, J. Conway & R. Booth

  2. Department of Physics and Astronomy, University of Kentucky, Lexington, KY, USA

    M. Elitzur

Authors
  1. M. Pestalozzi
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  2. M. Elitzur
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  3. J. Conway
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  4. R. Booth
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Corresponding author

Correspondence to M. Pestalozzi.

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Pestalozzi, M., Elitzur, M., Conway, J. et al. NGC7538 Irs1 N: Modeling a Circumstellar Maser Disk. Astrophys Space Sci 295, 231–236 (2005). https://doi.org/10.1007/s10509-005-3696-8

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  • DOI: https://doi.org/10.1007/s10509-005-3696-8

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