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2001MNRAS.324...57G - Mon. Not. R. Astron. Soc., 324, 57-67 (2001/June-2)

Dust radiation fields and pumping of excited state OH masers in W3(OH).


Abstract (from CDS):

I show that it is quite possible to obtain saturating amplification in the 13.44-GHz maser which is so far unique to W3(OH), using a combined radiative and collisional pumping scheme. The dominant radiative part of the pump involves far-infrared line overlap, and the far-infrared continuum is provided by dust, modelled as either a two-component mixture or composite grains. Transport of the far-infrared radiation is carried out via the accelerated lambda iteration method. The observational link between 13.44-GHz and 6035-MHz masers is reproduced by the model. Inadequate amplification in Sobolev models probably results from the optical depth limitations imposed by this approximation. I review the dust models used in far-infrared pumping models of OH masers, and conclude that the main consequence of moving from skewed blackbody functions to more sophisticated models is a selective pumping enhancement when ice mantles are included.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): masers - radiative transfer - stars: formation - dust, extinction - ISM: individual: W3(OH)

Simbad objects: 3

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