An OH survey on the 1720-MHz transition and comparisons with 1612, 1665 and 1667-MHz observations

Details An OH survey on the 1720-MHz transition and comparisons with 1612, 1665 and 1667-MHz observations An OH survey on the 1720-MHz transition and comparisons with 1612, 1665 and 1667-MHz observations

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..219h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 178, Jan. 1977, p. 219-230.

Astronomy and Astrophysics

Astronomy

15

Absorption Spectra, Electron Transitions, Hydrogen Clouds, Hydroxyl Emission, Interstellar Masers, Line Spectra, Brightness Temperature, Fine Structure, Ground State, Line Shape, Maser Outputs

Scientific paper

A search for emission and absorption in the 1720-MHz OH transition has been made at low galactic latitudes over the longitude range from 326 to 340 deg. No new strong small-diameter 1720-MHz maser sources were found. However, many 1720-MHz emission regions of low surface brightness were detected; in many cases they were measurably extended relative to the 12-arcmin beam. A number of prominent absorption features were also found. Comparison with a previous survey at 1612 MHz showed that, in most cases, 1612-MHz absorption accompanied 1720-MHz emission while extended 1612-MHz emission accompanied 1720-MHz absorption. In both types of region, absorption was evident in the 18-cm OH main lines (1665- and 1667-MHz transitions).

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