A periodically active pulsar giving insight into magnetospheric physics

A.G. Lyne; C.A. Jordan; D.R. Lorimer (Jodrell Bank Observatory; J.T. O'Brien; Macclesfield; M. Kramer; SK11 9DL; UK); University of Manchester

arxiv: astro-ph/0604605 · v1 · submitted 2006-04-28 · 🌌 astro-ph

A periodically active pulsar giving insight into magnetospheric physics

M. Kramer , A.G. Lyne , J.T. O'Brien , C.A. Jordan , D.R. Lorimer (Jodrell Bank Observatory , University of Manchester , Macclesfield , SK11 9DL

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keywords pulsarmagnetosphericradioswitcheswhenactivecurrentsdays

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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.

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