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Pumping Mechanisms of OH Masers

  • A. Omont (a1) (a2), J. Guibert (a1), S. Guilloteau (a1) (a2), V. Bujarrabal (a1) and Nguyen-Q-Rieu (a1)...

Abstract

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.

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References

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