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XMM-Newton and NICER Measurement of the Rms Spectrum of the Millihertz Quasiperiodic Oscillations in the Neutron-star Low-mass X-Ray Binary 4U 1636-53

Lyu, M., Zhang, G., Méndez, M., Altamirano, D., Mancuso, G. C., Xiang, F-Y. & Xiao, H., 3-Jun-2020, In : The Astrophysical Journal. 895, 2, 6 p., 120.

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  • XMM-Newton and NICER Measurement of the Rms Spectrum of the Millihertz Quasiperiodic Oscillations in the Neutron-star Low-mass X-Ray Binary 4U 1636–53

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DOI

  • Ming Lyu
  • Guobao Zhang
  • Mariano Méndez
  • D. Altamirano
  • G. C. Mancuso
  • Fu-Yuan Xiang
  • Huaping Xiao
We used two XMM-Newton and six Neutron Star Interior Composition Explorer observations to investigate the fractional rms amplitude of the millihertz quasiperiodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1636-53. We studied, for the first time, the fractional rms amplitude of the mHz QPOs versus energy in 4U 1636-53 down to 0.2 keV. We find that, as the energy increases from ∼0.2 to ∼3 keV, the rms amplitude of the mHz QPOs increases, different from the decreasing trend that has been previously observed above 3 keV. This finding has not yet been predicted by any current theoretical model; however, it provides an important observational feature to speculate whether a newly discovered mHz oscillation originates from the marginally stable nuclear burning process on the neutron-star surface.
Original languageEnglish
Article number120
Number of pages6
JournalThe Astrophysical Journal
Volume895
Issue number2
Publication statusPublished - 3-Jun-2020

    Keywords

  • Low-mass x-ray binary stars, Neutron stars, Astrophysical explosive burning, FREQUENCY, BURSTS, DISCOVERY, QPOS, LINE

ID: 127342041