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In August 2002, XMM-Newton devoted two full orbits to the observation of 1E1207.4-5209, making this isolated neutron star the most deeply scrutinizedgalactic target of the mission. Thanks to the high throughput of the EPICinstrument, ~360,000 photons were collected from the source, allowing for avery sensitive study of the temporal and spectral behaviour of this object. Thespectral data, both time-averaged and phase-resolved, yield one compellinginterpretation of the observed features: cyclotron absorption from onefundamental (~0.7 keV) and three harmonics, at ~1.4, ~2.1 and ~2.8 keV.Possible physical consequences are discussed, also on the basis of the obviousphase variations of the features' shapes and depths. We also present deep VLToptical data which we have used to search for a counterpart, with negativeresults down to ~27.Comment: 25 pages, 9 postscript figures. Accepted for publication in Astronomy  & Astrophysic

XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4–5209