Hard X-ray properties of magnetic cataclysmic variables
Hill, A. B.; Knigge, C.; Bird, A. J.; Fiocchi, M.; Scaringi, S.; Landi, R.; Bassani, L.; Bazzano, A.; Clark, D. J.; Dean, A. J.; Norton, A. J.; Barlow, E. J.
United Kingdom, Italy
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 Pspin/Porb<0.1 above the period gap. The observational features of the Pspin-Porb plane are discussed in the context of mCV evolution scenarios. We also present evidence for correlations between hard X-ray spectral hardness and Pspin, Porb and Pspin/Porb. An attempt to explain the observed correlations is made in the context of mCV evolution and accretion footprint geometries on the white dwarf surface.