A Possible 55-day X-ray Period of the Ultraluminous Accreting Pulsar M82 X-2
arXiv:1606.08520 · doi:10.1093/mnras/stw1558
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.
6 pages; accepted for publication in MNRAS
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- M51 ULX-7: super-orbital periodicity and constraints on the neutron star magnetic field
- A ~60-day super-orbital period originating from the ultraluminous X-ray pulsar in M82
- Modeling the light curves of ultraluminous X-ray sources as precession
- SWIFT Detection of a 65-Day X-ray Period from the Ultraluminous Pulsar NGC 7793 P13
- The impact of precession on the observed population of ULXs