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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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    Title
    • SwiftJ0525.6+2416 and IGRJ04571+4527: two new hard X-ray-selected magnetic cataclysmic variables identified with XMM-Newton
    Author
    • Bernardini, F.. New York University Abu Dhabi, Saadiyat Island, Abu Dhabi, 129188, UAE
    • de Martino, D.. INAF − Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, I-80131 Napoli, Italy
    • Mukai, K.. CRESST and X-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
    • Israel, G.. INAF - Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio Catone, Roma, Italy
    • Falanga, M.. International Space Science Institute (ISSI), Hallerstrasse 6, CH-3012 Bern, Switzerland
    • Ramsay, G.. Armagh Observatory, College Hill, Armagh BT61 9DG, UK
    • Masetti, N.. INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica, Via Gobetti 101, I-40129 Bologna, Italy
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 453, no. 3, p. 3100-3106. Oxford University Press
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:291373
    Summary
    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