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Multi-wavelength observations of the black-widow binary system 2FGLJ2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 wasrecently categorized as a black widow in which a recycled millisecond pulsar(MSP) is evaporating up the companion star with its powerful pulsar wind. Ouroptical observations show clear sinusoidal light curves due to the asymmetrictemperature distribution of the companion star. Assuming a simple geometry, weconstrained the range of the inclination angle of the binary system to52$^{\circ}$ < i < 59$^{\circ}$, which enables us to discuss the interactionbetween the pulsar wind and the companion in detail. The X-ray spectrumconsists of two components: a soft, steady component that seems to originatefrom the surface of the MSP, and a hard variable component from thewind-termination shock near the companion star. The measured X-ray luminosityis comparable to the bolometric luminosity of the companion, meaning that theheating efficiency is less than 0.5. In the companion orbit, 10$^{11}$ cm fromthe pulsar, the pulsar wind is already in particle dominant-stage, with amagnetization parameter of $\sigma$ < 0.1. In addition, we preciselyinvestigated the time variations of the X-ray periodograms and detected aweakening of orbital modulation. The observed phenomenon may be related to anunstable pulsar-wind activity or a weak mass accretion, both of which canresult in the temporal extinction of radio-pulse.

Multi-wavelength observations of the black widow pulsar 2FGL J2339.6-0532 with OISTER and Suzaku