Survey of OH Masers at 1665 MHz. III. Galactic Longitudes 233° to 326°

Abstract

We have searched the galactic plane from longitude 233� to 326� for OH emission on the 1665 MHz transition. Between longitudes 270� and 326�, where the survey zone was a uniformly sampled grid, we detected 35 OH maser sources, including 24 new ones; most are of the Type I variety that delineates sites of current star formation, and many of the sites are young, with no well-developed HII regions in the vicinity. By combining the present results with those of earlier surveys Oongitudes 326� ? 360� ? 2�: Parts I and II) we have improved on previous estimates of the galactic distribution of these masers.