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Published online by Cambridge University Press: 30 March 2016
The EO galaxy M87 harbours the prototypical and most studied example of an optical jet. First observed by Curtis in 1918, it remained little more than a curiosity, until Baade and Minkowski studied it in 1954 and first used the term “jet” to describe the sequence of optical knots extending to about 20” from the nucleus. Since then, the jet has been observed at radio (Owen, Hardee & Cornwell, 1989, Biretta, Stern & Harris 1991), optical (de Vaucouleurs & Nieto 1979, Keel 1988, Fraix-Burnet, Le Borgne & Nieto 1989) and X-rays wavelengths (Schreier, Gorenstein & Feigelson, 1982).