SwiftJ0525.6+2416 and IGRJ04571+4527: two new hard X-ray-selected magnetic cataclysmic variables identified with XMM-Newton
Bernardini, F. ; de Martino, D. ; Mukai, K. ; Israel, G. ; Falanga, M. ; Ramsay, G. ; Masetti, N.
In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 453, no. 3, p. 3100-3106
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- IGRJ04571+4527 and SwiftJ0525.6+2416 are two hard X-ray sources detected in the Swift/BAT and INTEGRAL/IBIS surveys. They were proposed to be magnetic cataclysmic variables of the intermediate polar (IP) type, based on optical spectroscopy. IGRJ04571+4527 also showed a 1218s optical periodicity, suggestive of the rotational period of a white dwarf, further pointing towards an IP classification. We here present detailed X-ray (0.3-10keV) timing and spectral analysis performed with XMM-Newton, complemented with hard X-ray coverage (15-70keV) from Swift/BAT. These are the first high-S/N observations in the soft X-ray domain for both sources, allowing us to identify the white dwarf X-ray spin period of SwiftJ0525.6+2416 (226.28s), and IGRJ04571+4527 (1222.6s). A model consisting of multitemperature optically thin emission with complex absorption adequately fits the broad-band spectrum of both sources. We estimate a white dwarf mass of about 1.1 and 1.0M⊙ for IGRJ04571+4527 and SwiftJ0525.6+2416, respectively. The above characteristics allow us to unambiguously classify both sources as IPs, confirming the high incidence of this subclass among hard X-ray emitting cataclysmic variables