Pulsar glitches as probes of neutron star interiors

Article Abstract:

A new study of the post-glitch recovery of pulsar rotation rates shows that the loose portion of the neutron star interior bears no less than 0.8% of the total moment of inertia without regard to how the star's interior and crust are linked. A glitch or abrupt rise in pulsar rotation rise is believed to result from the transfer of angular momentum from the star's solid crust to the faster-rotating interior. Analysis of post-glitch return to normal rotation in four pulsars demonstrates a limit on the moment of inertia that precludes equations of state that are soft at high densities.

Stars, Neutron stars, Astronomical rotation

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Pulsar's double period confirmed

Article Abstract:

Pulsar PSR1257+12 may be orbited by two objects whose masses indicate that they are probably planets. Data obtained by the National Radio Astronomy Observatory in Green Bank, WV were consistent with the dual-planet perturbation model suggested by A. Wolszczan and D.A. Frail. However, ambiguities in the data must be resolved before the small orbital perturbations predicted by F.A. Rasio and colleagues can be found; these small perturbations would prove the planetary model.

Research, Extrasolar planets, National Radio Astronomy Observatory

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Pulsar emissions

Article Abstract:

Radio pulsars' emission of hard photons probably results from a pair-production cascade aided by the system's net charge. PSR1509-58 is the latest object to be identified as a hard photon-producing radio pulsar. An activity index, in which the polar surface magnitude is divided by the rotation period, is probably the best method of measuring the radio pulsars' energetic emissions. The pulsars' ages are inversely proportional to their place on the activity index.

Models, Radio astrophysics

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