A 1667 MHz OH Absorption Survey of the Southern Milky Way

Abstract

A search has been made at 1667 MHz for OH absorption against 105 strong continuum sources in the region 2650 < I < 352°, and data are presented for 33 sources showing absorption. The overall distribution of OH absorption in this galactic longitude range has been investigated by combining these results with measurements on 11 additional sources studied in earlier searches. Many of the sources showing 1667 MHz absorption have been observed at the other three 18 cm OH transitions and as a result 14 new satellite-line emission sources have been found.