Hard X-ray properties of magnetic cataclysmic variables

Scaringi, S.; Bird, A. J.; Norton, A. J.; Knigge, C.; Hill, A. B.; Clark, D. J.; Dean, A. J.; Barlow, E. J.; Bassani, L.; Bazzano, A.; Fiocchi, M.; Landi, R.; Comastri, A.; Angelini, L. and Cappi, M. (2010). Hard X-ray properties of magnetic cataclysmic variables. In: X-ray astronomy 2009; Present Status, Multi-wavelength Approach and Future Perspectives, 7-11 Sep 2009, Bologna, Italy, p. 201.

DOI: https://doi.org/10.1063/1.3475205

Abstract

We have constructed a new sample of magnetic cataclysmic variables (mCVs) by cross-correlating candidate sources detected in INTEGRAL/IBIS observations against catalogues of known CVs and included mCVs observed with either Swift/BAT or SUZAKU/HXD. Here we review the properties arising from this hard X-ray selected sample and find that most hard X-ray detected mCVs have P_spin/P_orb<0.1 above the period gap. The observational features of the P_spin–P_orb plane are discussed in the context of mCV evolution scenarios. We also present evidence for correlations between hard X-ray spectral hardness and P_spin, P_orb and P_spin/P_orb. An attempt to explain the observed correlations is made in the context of mCV evolution and accretion footprint geometries on the white dwarf surface.

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