A soft-spectrum PULX candidate is reported in Cen A but XMM-SAS randomisation during data reduction renders the marginal 1.27 Hz pulsation detection unreliable across repeated reductions.
A Possible 55-day X-ray Period of the Ultraluminous Accreting Pulsar M82 X-2
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abstract
We report a possible detection of a 55-day X-ray modulation for the ultraluminous accreting pulsar M82 X-2 from archival Chandra observations. Because M82 X-2 is known to have a 2.5-day orbital period, if the 55-day period is real, it will be the superorbital period of the system. We also investigated variabilities of other three nearby ultraluminous X-ray sources in the central region of M82 with the Chandra data and did not find any evidence of periodicities. Furthermore, we re-examined the previously reported 62-day periodicity near the central region of M82 by performing a systematic timing study with all the archival Rossi X-Ray Timing Explorer and Swift data. Using various dynamic timing analysis methods, we confirmed that the 62-day period is not stable, suggesting that it is not the orbital period of M82 X-1 in agreement with previous work.
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astro-ph.HE 2years
2026 2representative citing papers
A modified ellipsoidal modulation model with precessing disk irradiation effects revises the SMC X-1 pulsar mass to approximately 1.35 solar masses.
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Significant or Not? The Impact of Randomisation During Data Reduction on Confirming a New Pulsating Ultraluminous X-ray Source Candidate in Centaurus A
A soft-spectrum PULX candidate is reported in Cen A but XMM-SAS randomisation during data reduction renders the marginal 1.27 Hz pulsation detection unreliable across repeated reductions.
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Optical Super-orbital Modulation of SMC X-1: Disk Precession and a Revised Pulsar Mass
A modified ellipsoidal modulation model with precessing disk irradiation effects revises the SMC X-1 pulsar mass to approximately 1.35 solar masses.