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The jansky (symbol: Jy ), sometimes called the unit of flow, is the unit generally employed in Radioastronomie to measure the intensity, or more precisely the Density flux, of the signals radio of galactic origin or extragalactic.
To measure the intensity of a signal, it is necessary to take account of the surface of the reception antenna and the width of the waveband of the signal. Consequently, one defines a jansky as being a flow of 10-26 Watt S by Square meter of surface of reception and by hertz of bandwidth, jansky is 1 = 10-26 W.m-2.Hz-1.
Although it is not a unit of the international Système, the jansky is approved by the international astronomical Union and is largely widespread among the radio astronomers. The radio sources most intense have densities flux of order 1 jansky, which makes jansky a suitable unit for this kind of signals.
She is baptized name of Karl Jansky, the American physicist which discovered the waves radio of galactic origin in 1930.
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