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Many new and unidentified Galactic sources have recently been revealed byongoing hard X-ray surveys. A significant fraction of these have been shown tobe the type of accreting white dwarfs known as cataclysmic variables (CVs).Follow-up observations are often required to categorize and classify thesesources, and may also identify potentially unique or interesting cases. Onesuch case is IGR J18007-4146, which is likely a CV based on follow-up Chandraobservations and constraints from optical/IR catalogs. Utilizing simultaneousXMM-Newton and NuSTAR observations, as well as the available optical/IR data,we confirm the nature of IGR J18007-4146 as an intermediate polar type CV.Timing analysis of the XMM data reveals a periodic signal at 424.4 +/- 0.7 sthat we interpret as the spin period of the white dwarf. Modeling the 0.3-78keV spectrum, we use a thermal bremsstrahlung continuum but require intrinsicabsorption as well as a soft component and strong Fe lines between 6 and 7 keV.We model the soft component using a single-temperature blackbody with kT = 73+8/-6 eV. From the X-ray spectrum, we are able to measure the mass of the whitedwarf to be 1.06 +0.19/-0.10 Msun, which means IGR J18007-4146 is more massivethan the average for magnetic CVs.

Classifying IGR J18007-4146 as an intermediate polar using XMM and NuSTAR