Paper:	Looking at Nuclei: Megamasers and Molecules
Volume:	320, The Neutral ISM in Starburst Galaxies
Page:	167
Authors:	Baan, W.; Klockner, H.-R.
Abstract:	Molecular emissions are powerful tracers of intense heating and star-formation processes. In this paper we consider the characteristics of Megamaser emission that originate in some active nuclei that are powered by intense star-formation or accretion onto a massive compact object. The OH Megamaser and possibly the H2CO Megamaser activity occurs among the most luminous sources in the population of (Ultra-) Luminous Infrared Galaxies. In addition, we consider the systematic behavior of the line emission of high-density tracer molecules. An evolutionary scenario is presented for ULIRGs that may explain the molecular line ratios observed in the population of FIR galaxies.

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