A Radiative Pumping Scheme for OH and H2O Masers in Massive Star Forming Regions
Autor: | James R. Forster, Yingping Liu, Han-Ping Liu, Jin Sun |
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Rok vydání: | 2006 |
Předmět: |
Physics
Astronomy and Astrophysics Astrophysics Cosmology Dissociation (chemistry) Large sample law.invention Space and Planetary Science law Radiative transfer Astrophysics::Solar and Stellar Astrophysics OH/IR star Astrophysics::Earth and Planetary Astrophysics Physics::Chemical Physics Maser Astrophysics::Galaxy Astrophysics |
Zdroj: | Astrophysics and Space Science. 307:357-363 |
ISSN: | 1572-946X 0004-640X |
Popis: | 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. |
Databáze: | OpenAIRE |
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