A systematic Z1^2 and maximum-likelihood search of RXTE data finds dozens of intermittent pulse candidates in three accreting millisecond pulsars and derives an 8.76 h orbital period for SAX J1748.9-2021.
Search for Intermittent X-ray Pulsations from Neutron Stars in Low Mass X-ray Binaries
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abstract
We present the results of our extensive binary orbital motion corrected pulsation search for 13 low mass X-ray binaries (LMXBs). These selected sources exhibit burst oscillations in X-rays with frequencies ranging from 45 to 1122 Hz, and have a binary orbital period varying from 2.1 to 18.9 hours. We first determined episodes that contain weak pulsations around the burst oscillation frequency by searching all archival Rossi X-ray Timing Explorer (RXTE) data of these sources. Then, we applied Doppler corrections to these pulsation episodes to discard the smearing effect of the binary orbital motion and searched for recovered pulsations at the second stage. Here we report 75 pulsation episodes that contain weak but coherent pulsations around the burst oscillation frequency. Furthermore, we report eight new episodes that show relatively strong pulsations in the binary orbital motion corrected data.
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An Elaborate Search for Coherent Pulsations from Intermittent-AMXPs
A systematic Z1^2 and maximum-likelihood search of RXTE data finds dozens of intermittent pulse candidates in three accreting millisecond pulsars and derives an 8.76 h orbital period for SAX J1748.9-2021.