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Pumping Mechanisms of OH Masers

Published online by Cambridge University Press:  14 August 2015

A. Omont ,
J. Guibert ,
S. Guilloteau ,
V. Bujarrabal  and
Nguyen-Q-Rieu
A. Omont
Affiliation:
1Observatoire de Meudon, France 2Ecole Normale Supérieure, Paris
J. Guibert
Affiliation:
1Observatoire de Meudon, France
S. Guilloteau
Affiliation:
1Observatoire de Meudon, France 2Ecole Normale Supérieure, Paris
V. Bujarrabal
Affiliation:
1Observatoire de Meudon, France
Nguyen-Q-Rieu
Affiliation:
1Observatoire de Meudon, France

Abstract

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We analyze in detail the pumping of 18 cm OH masers by the overlap of far infra-red lines in HII/OH regions and in circumstellar shells. We present some results of a model of pumping of HII/OH masers by thermal overlap. Pumping by overlap appears to be quite general but very complicated. It can account for the different observed main-line masers. However, other types of pumping, mainly by collisions with H or by near infra-red radiation, are possible if certain conditions are met for the physical and astrophysical parameters.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 559 - 564
Copyright
Copyright © Reidel 1980 

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