Rapid X-ray variability properties during the unusual very hard state in neutron-star low-mass X-ray binaries

@article{Wijnands2017RapidXV,
  title={Rapid X-ray variability properties during the unusual very hard state in neutron-star low-mass X-ray binaries},
  author={Rudy Wijnands and Aastha S. Parikh and Diego Altamirano and Jeroen Homan and Nathalie Degenaar},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2017},
  volume={472},
  pages={559-576}
}
Here, we study the rapid X-ray variability (using XMM-Newton observations) of three neutron-star low-mass X-ray binaries (1RXS J180408.9-342058, EXO 1745-248 and IGR J18245-2452) during their recently proposed very hard spectral state. All our systems exhibit a strong to very strong noise component in their power density spectra (rms amplitudes ranging from 34 per cent to 102 per cent) with very low characteristic frequencies (as low as 0.01 Hz). These properties are more extreme than what is… 

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