XMM-Newton Proposal 03004801

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Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Oj 287, Xmm-Newton Proposal 03004801

Scientific paper

The BL Lac object OJ 287 (z=0.306) is a highly variable, low-energy peaked blazar, which has shown intermittent emission with outstanding pseudo-periodic outbursts every 11-12 years. Long-term and densely-sampled light curves have been collected in the radio and optical bands since 1891. We aim at studying the spectral and temporal behaviour of OJ 287, on both long and short time scales, in the radio, mm, optical, UV and X-ray band, before the next major outburst, expected to occur in spring or fall 2006. Ground-based multifrequency campaigns have already been planned in the frame of the WEBT and ENIGMA collaborations and VLBI observations proposed, in order to search for correlations among the synchrotron radio-mm flux, the parsec jet structure and the inverse-Compton X-ray emission.

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