5cm OH masers as diagnostics of physical conditions in star-forming regions

Details 5cm OH masers as diagnostics of physical conditions in star-forming regions 5cm OH masers as diagnostics of physical conditions in star-forming regions

2000-02-18

arxiv.org/abs/astro-ph/0002367v1

Astronomy and Astrophysics

Astrophysics

TeX 15 pages, 30 postscript figures, accepted by ApJ

Scientific paper

10.1086/308763

We demonstrate that the observed characteristics of the 5 cm OH masers in star-forming regions can be explained with the same model and the same parameters as the 18 cm and the 6 cm OH masers. In our already published study of the 18 cm and the 6 cm OH masers in star-forming regions we had examined the pumping of the 5 cm masers, but did not report the results we had found because of some missing collision rate coefficients, which in principle could be important. The recently published observations on the 5 cm masers of OH encourage us to report our old calculations along with some new ones that we have performed. These calculations, in agreement with the observations, reveal the main lines at 5 cm as strong masers, the 6049 MHz satellite line as a weak maser, and the 6017 MHz satellite line as never inverted for reasonable values of the parameters

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