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Discovery of an ultracompact gamma-ray millisecond pulsar binary candidate

We report multi-wavelength observations of the unidentified Fermi object 2FGL J1653.6-0159. With the help of high-resolution X-ray observation, we have identified an X-ray and optical counterpart of 2FGL J1653.6-0159. The source exhibits a periodic modulation of 75 min in optical and possibly also in X-ray. We suggest that 2FGL J1653.6-0159 is a compact binary system with an orbital period of 75 min. Combining the gamma-ray and X-ray properties, 2FGL J1653.6-0159 is potentially a black widow/redback type gamma-ray millisecond pulsar (MSP). The optical and X-ray lightcurve profiles show that the companion is mildly heated by the high-energy emission and the X-rays are from intrabinary shock. Although no radio pulsation has been detected yet, we estimated that the spin period of the MSP is ~2ms based on a theoretical model. If pulsation can be confirmed in the future, 2FGL J1653.6-0159 will become the first ultracompact rotation-powered MSP.

preprint2014arXivOpen access
A. K. H. KongR. JinT. -C. YenC. P. HuC. Y. HuiP. H. T. TamJ. TakataL. C. C. LinK. S. ChengS. M. ParkC. L. Kim
astro-ph.HE
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A. K. H. KongR. JinT. -C. YenC. P. HuC. Y. HuiP. H. T. TamJ. TakataL. C. C. LinK. S. ChengS. M. ParkC. L. Kim

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