Harmonic coupling of red noise in SAX j1808.4-3658
We have detected a broadening in the wings of the first harmonic peak in the power spectrum of the X-ray millisecond binary pulsar SAX J1808.4-3658. This feature results from the convolution of the red noise present in the power spectrum with the harmonic line. This demonstrates that the aperiodic v...
| Main Authors: | , , , , |
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| Format: | Conference item |
| Published: |
2001
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| Summary: | We have detected a broadening in the wings of the first harmonic peak in the power spectrum of the X-ray millisecond binary pulsar SAX J1808.4-3658. This feature results from the convolution of the red noise present in the power spectrum with the harmonic line. This demonstrates that the aperiodic variability (that causes the red noise) is modulated at the spin period, therefore suggesting that it originates at the magnetic caps close to the neutron star surface. This is consistent with what has been found in some high mass X-ray pulsators. |
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