Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..555g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 555-569.
Astronomy and Astrophysics
Astrophysics
73
Hydroxyl Emission, Interstellar Masers, Radiative Transfer, Star Formation, Far Infrared Radiation, Very Long Base Interferometry
Scientific paper
The interferometric observations of OH masers in star-forming regions are reviewed, with emphasis on VLBI data. A model of the OH maser zone described in Gray et al. (1991) and a theory of maser propagation in Field and Gray (1988) are employed to establish the physical conditions under which intense maser beams may form in the 18-, 5-, and 6-cm lines. It is shown that bright 1665-MHz spots indicate the presence of velocity shifts caused by accelerating flows of gold (not greater than 75 K) gas. Similar results are presented for the 1667-, 1720-, 1612-, 6035-, and 4765-MHz lines, and the association of 1720 and 4765 MHZ is demonstrated. A specific region of W3(OH) in which 1720-, 4765-, and 1665-MHz masers are spatially coincident at different V(lsr) is analyzed.
Doel R. C.
Field David
Gray Malcolm D.
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