Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..691f&link_type=abstract
Astronomical Journal, vol. 87, Apr. 1982, p. 691-694.
Astronomy and Astrophysics
Astronomy
14
Hydroxyl Emission, Interstellar Masers, Stellar Evolution, Transition Probabilities, Very Long Base Interferometry, Ground State, H Ii Regions, Hydroxyl Radicals, Milky Way Galaxy, Power Spectra
Scientific paper
In order to define the spatial relationship of maser emissions from different transitions of the hydroxyl radical and to provide constraints on how OH masers are pumped, attempts were made to determine accurate relative positions of the emission from all ground-state transitions in two sources. Four ground-state transitions were observed from the sources W3(OH) and Sgr B2. The positions of the strongest maser features at 1612, 1667, and 1720-MHz were obtained relative to the 1665 MHz feature by an analysis of the fringe-rate residuals. All four ground-state masers come from the same general region, within 2 arcsec of the center of a very compact H II region, and thus all appear to share a common source of excitation. A comparison of total power spectra suggests that most OH maser features have lifetimes greater than several decades.
Fouquet J. E.
Reid Mark J.
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