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Roncadelli","submitted_at":"2012-03-09T21:00:36Z","abstract_excerpt":"The mixing of photons with axion-like particles (ALPs) in the large-scale magnetic field $B$ changes the polarization angle of a linearly polarized photon beam from active galactic nuclei in radio galaxies as it propagates over cosmological distances. Using available ultraviolet polarization data concerning these sources we derive a new bound on the product of the photon-ALP coupling $g_{a\\gamma}$ times $B$. We find $g_{a\\gamma} B \\lesssim 10^{-11}$ GeV$^{-1}$ nG for ultralight ALPs with $m_a \\lesssim 10^{-15}$ eV. 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