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MegaMasers and gigaMasers: A close lookat Active Nuclei

Published online by Cambridge University Press:  26 January 2006

L.I. Gurvits ,
S. Frey ,
S. Rawlings  and
W. A. Baan
W. A. Baan*
Affiliation:
ASTRON, Westerbork Observatory, PO Box 2, 7990 AA Dwingeloo, The Netherlands
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Abstract

Molecular emissions are powerful tracers of intense heating andstar-formation processes. In this paper we consider thecharacteristics of Megamaser emission that originate in some activenuclei that are powered by intense star-formation or accretion onto amassive compact object. The OH and possibly the H2CO Megamaseractivity occurs among the most luminous sources in the population of(Ultra-) Luminous Infrared Galaxies. In addition, we consider thesystematic behaviour of the line emission of high-density tracermolecules. An evolutionary scenario is presented for ULIRGs that mayexplain the molecular line ratios observed in the population of FIRgalaxies.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 15: Radio Astronomy from Karl Jansky to Microjansky – JENAM'03 , 2005 , pp. 317 - 330
Copyright
© EAS, EDP Sciences, 2005

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