Timing of the Accreting Millisecond Pulsars: The Strange Case of XTE J1807-294 and XTE J1751-305

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present a comprensive phase-coherent timing study of the most extreme accreting millisecond pulsar (AMP) XTE J1807-294 (5.2 ms spin period). This is the AMP with the strongest timing noise contamination in the post-fit timing residuals among the 10 known AMPs and shows an enigmatic linear anticorrelation between the fractional amplitude of the pulsations and the timing residuals. It also shows strong time lags, a peculiar pulse spectrum and sudden changes in the pulse profile shape not easily explained with current emission mechanism models. We compare our findings with the most stable AMP known (XTE J1751-305), where almost no timing noise in the post-fit residuals and no pulse shape variation is present. We give a tentative explaination for these differencese in behavior and introduce the use of the SigmaZ statistic to measure the timescales of the noise processes and the stability of the pulsar spin periods.

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