Soft X-Ray Millisecond Variability from an Accreting Neutron Star

Physics

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White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 1636-536, 4U 1636-536, Xmm-Newton Proposal 05003502

Scientific paper

The discovery of millisecond variability in the hard (2.5-30 keV) emission of neutron-star low-mass x-ray binaries opened a new window on the study of the accretion flow and the effects of strong gravitational fields in these systems. We propose to use XMM-Newton to search for millisecond variability in the soft x-ray band (0.4-2.5 keV), which is inaccessible to RXTE. We request two observations of 4U 1636-536 which has produces strong and narrow kHz quasiperiodic oscillations (QPOs) in hard x-rays and is in the continuous viewing zone of the Rossi X-Ray Timing Explorer. These observations should place important constraints on models of the kHz QPOs.

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