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A&A Supplement Ser., Vol. 124, July 1997, 85-108

Received August 26; accepted October 29, 1996

Further search for OH emission from IRAS sources

V.I. Slysh tex2html_wrap1425 - A.M. Dzura tex2html_wrap1427 - I.E. Val'tts tex2html_wrap1429 - E. Gerard tex2html_wrap1431

Send offprint request: E. Gerard

tex2html_wrap1433  Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia
tex2html_wrap1435 Departement de Radioastronomie, Observatoire de Paris, Section de Meudon, F-91195 Meudon Principal Cedex, France


Results of a continued search for OH main line emission from IRAS sources are reported. Towards a sample of 182 sources which consists of IRAS sources selected by the colour criterion for ultracompact HII region, and several IRAS cores, tex2html_wrap_inline1413 masers and bipolar outflows, we detected 19 new OH masers of Class I and 5 OH/IR candidates. The correlation between IR and OH maser flux is confirmed. Also 51 thermal and 4 absorption sources were detected. The low radial velocities and derived OH column densities suggest that the thermal OH emission comes from nearby dark clouds. There is evidence that IRAS sources towards which thermal emission was detected are connected with these dark clouds.

keywords: ISM: clouds -- ISM: molecules -- masers -- radio lines: ISM -- surveys

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