Detection of a New Microwave Spectral Line

Details Detection of a New Microwave Spectral Line Detection of a New Microwave Spectral Line

Jul 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967natur.215...40p&link_type=abstract

Nature, Volume 215, Issue 5096, pp. 40-41 (1967).

Astronomy and Astrophysics

Astronomy

42

Scientific paper

AFTER the radioastronomical detection1 of helium in 1966 a programme to study the 109α transition of neutral helium was begun at the US National Radio Astronomy Observatory, and helium has now been detected in five sources (as will be described elsewhere). During the course of this work, however, unidentified microwave spectral emission has also been detected in the sources NGC 2024 and IC 1795. This communication describes the observed physical characteristics of this emission, considers its possible origins and suggests further observations to identify it. In the succeeding communication, Goldberg and Dupree argue that the new line is a recombination line of carbon I.

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