Swift J0525.6+2416 and IGR J04571+4527: Two new hard X-ray-selected magnetic cataclysmic variables identified with XMM-Newton
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Archivos
Fecha
2015-11
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
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Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
IGR J04571+4527 and Swift J0525.6+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. IGR J04571+4527 also showed a 1218 s optical periodicity, suggestive of the rotational period of a white dwarf, further pointing towards an IP classification. We here present detailed X-ray (0.3–10 keV) timing and spectral analysis performed with XMM–Newton, complemented with hard X-ray coverage (15–70 keV) 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 Swift J0525.6+2416 (226.28 s), and IGR J04571+4527 (1222.6 s). 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 1.0 M⊙ for IGR J04571+4527 and Swift J0525.6+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.
Notas
Indexación: Scopus.
Palabras clave
Novae, Cataclysmic Variables, White Dwarfs, X-rays: individual: IGR J04571+4527 (1RXS J045707.4+452751, as Swift J0457.1+4528), As WISE J052522.84+24133333.6)
Citación
Monthly Notices of the Royal Astronomical Society. Volume 453, Issue 3, Pages 3100 - 3106. 1 November 2015
DOI
10.1093/mnras/stv1673