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We make a systematic analysis of the XMM-Newton X-ray spectra of intermediatepolars (IPs) and find that, contrary to the traditional picture, most show asoft blackbody component. We compare the results with those from AM Her starsand deduce that the blackbody emission arises from reprocessing of hard X-rays,rather than from the blobby accretion sometimes seen in AM Hers. Whether an IPshows a blackbody component appears to depend primarily on geometric factors: ablackbody is not seen in those that have accretion footprints that are alwaysobscured by accretion curtains or are only visible when foreshortened on thewhite-dwarf limb. Thus we argue against previous suggestions that the blackbodyemission characterises a separate sub-group of IPs which are more akin to AMHers, and develop a unified picture of the blackbody emission in these stars.

Why do some intermediate polars show soft X-ray emission? A survey of XMM-Newton spectra