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Following an extensive survey of the galactic plane by the INTEGRALsatellite, new hard X-ray sources are discovered with a significant fraction ofCataclysmic Variables (CVs) among them. We report here the identification ofone of these hard X-ray sources, IGR J00234+6141, as an accreting magneticwhite dwarf of intermediate polar type. We analyse the high energy emission ofthe INTEGRAL source using all available data and provide complementary opticalphotometric and spectroscopic data obtained respectively in August and October2006. Based on a refined INTEGRAL position, we confirm the proposed opticalidentification. We clearly detect the presence of a 564 s periodic opticalmodulation that we identify as the rotation of the white dwarf. The analysis ofthe optical spectrum also demonstrates that the emission lines show amodulation in radial velocity with an orbital period of Porb = (4.033 +/-0.005) hr. The two periodicities indicate that IGR00234+6141 is a magnetic CVof the intermediate polar type. This is one of the faintest and hardest sourcesof this type detected by INTEGRAL. This confirms earlier conclusions that IPscontribute significantly to the population of galactic X-ray sources andrepresent a significant fraction of the high energy background.

IGR J00234+6141 : a new INTEGRAL source identified as an Intermediate polar