Extragalactic Radio Sources
Twelve years after the publication of the first results obtained by Jansky in 1932, which marked the beginning of radio astronomy, Reber observed a radio-emission maximum in the constellation Cygnus. It was the first detection of Cygnus A, one of the brightest of all extragalactic sources (that is, located outside our Galaxy) in the radio region. These observations, made at low frequencies (160 MHz) and with the aid of small receivers, gave only a rough estimate of the position of the source. It was necessary to await the construction of interferometers (in Australia by Bolton and Stanley around 1948 and simultaneously in Britain by Ryle and Smith; the resolution obtained was of the order of 10′) before the radio emission could be better localized and possibly associated with a known object.
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