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Fifteen years of XMM‐Newton observations have established that ultrafast highly ionized winds (UFOs) are common in radio‐quiet active galactic nucleus (AGN). A simple theory of Eddington‐limited accretion correctly predicts the typical velocity (∼0.1c) and high ionization of such winds, with observed flow energy capable of ejecting star‐forming gas. An extended XMM‐Newton observation of the archetypal...
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