Excited OH 4.7-GHz masers associated with IRAS far-infrared sources - II

Details Excited OH 4.7-GHz masers associated with IRAS far-infrared sources - II Excited OH 4.7-GHz masers associated with IRAS far-infrared sources - II

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..808c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 3, pp. 808-820.

Astronomy and Astrophysics

Astronomy

26

Masers, Stars: Formation, Ism: Molecules, Infrared: Ism: Lines And Bands, Radio Lines: Ism

Scientific paper

A sample of 85 far-infrared sources selected from the IRAS Point Source Catalog has been searched for maser emission from excited OH in the ^2Pi_1/2 J=1/2 state, in the three transitions at 4765, 4750 and 4660 MHz. Four new detections were made at 4765 MHz, including one source where ground-state OH maser emission has not been reported. One new detection was made at 4660 MHz. This source OH 351.78-0.54 is remarkable in that it was detected only at 4660 MHz, and not at 4765 or 4750 MHz. Positions were measured for the new detections and for six previously known 4.7-GHz maser sources. In some cases the excited OH 4.7-GHz positions are significantly different from the positions of previously known ground-state OH 18-cm masers. The 4.7-GHz sources are among the brighter far-infrared sources in the IRAS sample. In most cases they are also OH 18-cm masers. There is a strong association between OH 4.7-GHz emission and OH 18-cm maser emission in the 1720-MHz transition. More than half of the 4.7-GHz masers that were examined for variability showed strong variations on a time-scale of a year.

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