Radiative pumping of 1612 MHz masers: OH/IR sources with IRAS LRS spectra
and 34.6 micrometer absorption feature.
Szczerba R., He J.H, Chen P.S.
2003, in Proceedings of the Symposium
"Exploiting the ISO Data Archive - Infrared Astronomy in the Interenet Age", Eds.C. Gry, S. Peschke, J. Matagne, P. Garcia-Lario, R. Lorente, & A. Salama, ESA SP-511, 101
Abstract:
- The population inversion which leads to the 1612 MHz OH maser emission
has long been thought to be radiatively pumped. Since OH rotational lines
involved in this pumping scheme lie in the far-infrared they became observable
only after the launch of the ISO satellite. With the aim to investigate
the pumping conditions of the 1612 MHz OH maser emission in more details
we have searched the ISO Archive for SWS observations around 34.6 um of
1024 OH/IR sources with IRAS LRS spectra from compilation of Chen et al.
(2001). Surprisingly, among 81 OH/IR sources which have appropriate SWS data
only already reported objects: VY CMa, IRC+10420 and the Galactic Center,
show clear 34.6 um absorption lines. We discuss possible reasons for non-detection
of this pumping line.
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