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19 April 2024

» arxiv » 1412.1306

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Accretion-powered pulsations in an apparently quiescent neutron star binary
Anne M. Archibald ; Slavko Bogdanov ; Alessandro Patruno ; Jason W. T. Hessels ; Adam T. Deller ; Cees Bassa ; Gemma H. Janssen ; Vicky M. Kaspi ; Andrew G. Lyne ; Ben W. Stappers ; Shriharsh P. Tendulkar ; Caroline R. D'Angelo ; Rudy Wijnands ;
Date:	3 Dec 2014
Abstract:	Accreting millisecond X-ray pulsars are an important subset of low-mass X-ray binaries in which coherent X-ray pulsations can be observed during occasional, bright outbursts (X-ray luminosity $L_Xsim 10^{36}$ erg s$^{-1}$). These pulsations show that matter is being channeled onto the neutron star’s magnetic poles. However, such sources spend most of their time in a low-luminosity, quiescent state ($L_Xlesssim 10^{34}$ erg s$^{-1}$), where the nature of the accretion flow onto the neutron star (if any) is not well understood. Here we report that the millisecond pulsar/low-mass X-ray binary transition object PSR J1023+0038 intermittently shows coherent X-ray pulsations at luminosities nearly 100 times fainter than observed in any other accreting millisecond X-ray pulsar. We conclude that in spite of its low luminosity PSR J1023+0038 experiences episodes of channeled accretion, a discovery that challenges existing models for accretion onto magnetized neutron stars.
Source:	arXiv, 1412.1306
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