NG7538 IRS1 N: modeling a circumstellar maser disk

Details NG7538 IRS1 N: modeling a circumstellar maser disk NG7538 IRS1 N: modeling a circumstellar maser disk

2004-07-19

arxiv.org/abs/astro-ph/0407388v1

Astronomy and Astrophysics

Astrophysics

To appear in The Proceedings of the 2004 European Workshop: "Dense Molecular Gas around Protostars and in Galatic Nuclei", Eds

Scientific paper

10.1007/s10509-005-3696-8

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-IRS1 N. 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 30 solar masses, suggested by other observations, our model fixes the masing disk to have inner and outer radii of about 270 AU and 750 AU.

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