A periodically active pulsar giving insight into magnetospheric physics

Abstract

PSR B1931+24 (J1933+2421) behaves as an ordinary isolated radio pulsar during active phases that are 5-10 days long. However, the radio emission switches off in less than 10 seconds and remains undetectable for the next 25-35 days, then it switches on again. This pattern repeats quasi-periodically. The origin of this behaviour is unclear. Even more remarkably, the pulsar rotation slows down 50% faster when it is on than when it is off. This indicates a massive increase in magnetospheric currents when the pulsar switches on, proving that pulsar wind plays a substantial role in pulsar spin-down. This allows us, for the first time, to estimate the currents in a pulsar magnetospheric during the occurrence of radio emission.

12 pages, 2 figures

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• NE2001.I. A New Model for the Galactic Distribution of Free Electrons and its Fluctuations
• Magnetar Spin-Down
• A powerful bursting radio source towards the Galactic Centre

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