On the night of Saturday, 2 September, Philip Gregory (University of Toronto) recorded at a frequency of 10.5 GHz what Gregory calls “the most impressive outburst ever witnessed by radio astronomers.” The event was in an x‐ray source, Cygnus X‐3, which is in our own galaxy, and its flux density in the radio had increased by a factor of 2000 over the level recorded two days earlier at the National Radio Astronomy Observatory by Robert Hjellming and Bruce Balick. Subsequent outbursts occurred later in September. These observations and a host of others are reported in a special issue of Nature Physical Science (239, 113–136, 1972), which contains 21 papers on Cygnus X‐3.
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© 1973 American Institute of Physics.
1973
American Institute of Physics
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