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

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

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324...57g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 1, pp. 57-67.

Astronomy and Astrophysics

Astronomy

10

Masers, Radiative Transfer, Stars: Formation, Dust, Extinction, Ism: Individual: W3(Oh)

Scientific paper

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.

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