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IGR J04571+4527 and Swift J0525.6+2416 are two hard X-ray sources detected inthe Swift/BAT and INTEGRAL/IBIS surveys. They were proposed to be magneticcataclysmic variables of the Intermediate Polar (IP) type, based on opticalspectroscopy. IGR J04571+4527 also showed a 1218 s optical periodicity,suggestive of the rotational period of a white dwarf, further pointing towardsan IP classification. We here present detailed X-ray (0.3-10 keV) timing andspectral analysis performed with XMM-Newton, complemented with hard X-raycoverage (15-70 keV) from Swift/BAT. These are the first high signal to noiseobservations in the soft X-ray domain for both sources, allowing us to identifythe white dwarf X-ray spin period of Swift J0525.6+2416 (226.28 s), and IGRJ04571+4527 (1222.6 s). A model consisting of multi-temperature optically thinemission with complex absorption adequately fits the broad-band spectrum ofboth sources. We estimate a white dwarf mass of about 1.1 and 1.0 solar massesfor IGR J04571+4527 and Swift J0525.6+2416, respectively. The abovecharacteristics allow us to unambiguously classify both sources as IPs,confirming the high incidence of this subclass among hard X-ray emittingCataclysmic Variables.

Swift J0525.6+2416 and IGR J04571+4527: two new hard X-ray selected magnetic cataclysmic variables identified with XMM-Newton