Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-03-28
Astronomy and Astrophysics
Astrophysics
9 Pages, LaTeX
Scientific paper
A sensitive search for 6.7--GHz methanol maser emission has been made towards 10 galaxies that have yielded detectable microwave molecular--line transitions. These include several which show OH megamaser or superluminous \water\/ maser emission. Within the Galaxy, \methanol\/ and OH masers often occur in the same star formation regions and, in most cases, the \methanol\/ masers have a greater peak flux density than their OH counterparts. Thus we might expect \methanol\/ masers to be associated with extragalactic OH maser sources. We failed to detect any emission or absorption above our 60--mJy detection limit. We conclude that if the physical conditions exist to produce \methanol\/ megamaser emission, they are incompatible with the conditions which produce OH megamaser emission.
Ellingsen Simon P.
McCulloch Peter M.
Norris Ray P.
Price Maribeth
Vaile R. A.
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