New OH Radio Emission Sources in Cygnus

Details New OH Radio Emission Sources in Cygnus New OH Radio Emission Sources in Cygnus

Apr 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.222...67e&link_type=abstract

Nature, Volume 222, Issue 5188, pp. 67-69 (1969).

Astronomy and Astrophysics

Astronomy

68

Scientific paper

ALL radio observational work on OH has so far been concentrated on previously known astronomical objects. Initially the OH microwave radiation was found absorbed in the spectra of strong continuum sources1, but in the search for more OH absorption lines weaker and weaker continuum sources were investigated. The guide in this search was the source catalogue made by Westerhout2, which contains sources around the galactic plane measured at the frequency 1,390 MHz. Many of these sources have a thermal spectrum and therefore are associated with H II regions. Because the first OH emission sources were found in or near some of these H II regions3,4, the search for more OH emission was carried out chiefly on thermal radio sources. Many new OH emission sources were found in this way and theories of maser action in OH associated with H II regions were produced5,6.

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