Detection of the Far-IR Pumping Lines for OH Masers

Details Detection of the Far-IR Pumping Lines for OH Masers Detection of the Far-IR Pumping Lines for OH Masers

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.251..271s&link_type=abstract

Astrophysics and Space Science, Volume 251, Issue 1-2, pp. 271-274

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Circumstellar hydroxyl (OH) masers are believed to be radiatively pumped (Elitzur et al. 1976). However, the proposed pumping mechanism has not been directly observed before now, because the far-IR spectral lines which correspond to the pumping cycle transitions are unobservable from the ground. We present ISO1 observations of the strong OH maser source IRC +10420. Our spectra clearly show the 34.6-µm doublet in absorption, and the ensuing rotational cascade lines at 98.7, 163 and 79 µm in emission. These spectra provide the first direct confirmation of the radiative pumping cycle for OH masers.

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