A Radiative Pumping Scheme for OH and H<Subscript>2</Subscript>O Masers in Massive Star Forming Regions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A Radiative Pumping Scheme for OH and H2O Masers in Massive Star Forming Regions

Authors:	Hanping Liu J. R. Forster Yingping Liu Jin Sun

Affiliation:	(1) Department of Physics, Beijing Normal University, Beijing, 100875, China;(2) University of California, Berkeley, and Hat Creek Radio Observatory, 96040, 42231 Bidwell Road, Hat Creek, CA, USA;(3) Information College, Beijing Union University, Beijing, 100101, China;(4) Department of Astronomy, Beijing Normal University, Beijing, 100875, China

Abstract:	Interstellar H₂O and OH masers associated with massive star-forming regions can be classified into three morphological types: isolated H₂O masers; isolated OH masers; and spatially overlapping OH/H₂O maser groups. In a large sample of star-forming regions the total number of maser groups of each type is approximately equal. In order to account for these statistics we propose a pumping scheme based on a broadband radiative pump which produces inverted populations of both OH and H₂O masers by a process involving predissociation and dissociation of H₂O. This scheme overcomes some drawbacks of earlier radiative pumping models, and may account for the association of OH and H₂O masers in massive star forming regions.

Keywords:	Interstellar masers OH and H₂O masers Pumping mechanism Radiative mechanism
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