Coupling Between Periodic and Aperiodic Variability in SAX J1808.4-3658
arXiv:astro-ph/0303606 · doi:10.1086/374588
Abstract
We detect a significant broadening in the wings of the 401 Hz peak in the power spectrum of the accreting millisecond binary pulsar SAX J1808.4-3658. This feature is consistent with the convolution of the red noise present in the power spectrum with the harmonic line. We conclude that the flux modulated by the spin period shows aperiodic variability similar to the red noise in the overall flux, suggesting such variability also originates at the magnetic caps close to the neutron star surface. This is analogous to the results found in some longer period, higher magnetic field pulsators in high mass X-ray binaries.
16 pages, 3 figures, to be published in The Astrophysical Journal
References in corpus (8)
- The two-hour orbit of a binary millisecond X-ray pulsar
- The broad-band power spectra of X-ray binaries
- The first outburst of SAX J1808.4-3658 revisited
- The broad-band power spectrum of SAX J1808.4-3658
- Constraints on the Neutron Star Magnetic Field of the two X-ray Transients SAX J1808.4-3658 and Aql X-1
- The X-ray Spectrum of SAX J1808.4-3658
- On the relationship between the periodic and aperiodic variability of accreting X-ray pulsars
- Discovery of Coupling between Periodic and Aperiodic Variability and X-ray Quasi-periodic Oscillations from Her X-1
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- Quasiperiodic oscillations in Cen X-3 and the long term intensity variations
- Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing
- Discovery of correlated optical/X-ray quasi-periodic oscillations in black hole binary SWIFT J1753.5-0127
- Spectral and temporal changes associated with flux enhancement in 4U 1626-67
- The aperiodic X-ray variability of the accreting millisecond pulsar SAX J1808.4-3658
- Long-term coherent timing of the accreting millisecond pulsar IGR J17062-6143
- Quasi-periodic pulse amplitude modulation in the accreting millisecond pulsar IGR J00291+5934