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A Model for the Molecular Maser Disk in NGC4258

Published online by Cambridge University Press:  26 May 2016

Natalia Babkovskaia  and
Juri Poutanen
Natalia Babkovskaia
Affiliation:
Astronomy Division, P. O. Box 3000, FIN-90014 University of Oulu, Finland
Juri Poutanen
Affiliation:
Astronomy Division, P. O. Box 3000, FIN-90014 University of Oulu, Finland

Abstract

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A model of the H2O maser disk observed in the nucleus of the galaxy NGC4258 is presented. The hot-gas–cold-dust pumping mechanism based on the difference between gas and dust temperatures and special features of the ice spectrum is used. Conditions for the maser level inversion are calculated in the case of unsaturated maser. It is shown based on the observational data that the maser in NGC 4258 seems to be unsaturated. In that case the spectrum of the maser radiation at λ = 1.35 cm including the central and high velocity components is calculated. The key parameters of the molecular maser disk are determined by comparing results of numerical simulations with the data.

Type
Part 8 Active Galaxies and their Nuclei
Information
Symposium - International Astronomical Union , Volume 214: High Energy Processes and Phenomena in Astrophysics , 2003 , pp. 293 - 294
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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