Pulsar Timing Noise: Magnetospheric State Switching or Free Precession?

Details Pulsar Timing Noise: Magnetospheric State Switching or Free Precession? Pulsar Timing Noise: Magnetospheric State Switching or Free Precession?

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832007j&link_type=abstract

American Astronomical Society, AAS Meeting #218, #320.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Recent radio pulsar observations have demonstrated two interesting phenomena. In some pulsars, smooth variations have been observed in spin-down rate and pulse profile. A precessional interpretation was initially suggested to account for this. In other pulsars, very sharp switches have been observed between different pulse profiles. In the case of at least one pulsar (PSR B1931+24), there is also a sharp change in spin-down rate. This has led to a new model of pulsar variability, based on changes in the magnetosphere rather than on precession. In this talk I will discuss whether or not these two models, precession and magnetospheric state switching, can be reconciled, and examine whether or not the precession hypothesis is still a plausible one in accounting for the smoother timing variations seen in many pulsars.

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