Spin-Kick Correlation in Neutron Stars: Alignment Conditions and Implications

Details Spin-Kick Correlation in Neutron Stars: Alignment Conditions and Implications Spin-Kick Correlation in Neutron Stars: Alignment Conditions and Implications

2006-07-31

arxiv.org/abs/astro-ph/0607666v3

Astrophys.J.656:399-407,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 8 figures. Accepted by ApJ

Scientific paper

10.1086/510352

Recent observations of pulsar wind nebulae and radio polarization profiles revealed a tendency of the alignment between the spin and velocity directions in neutron stars. We study the condition for spin-kick alignment using a toy model, in which the kick consists of many off-centered, randomly-oriented thrusts. Both analytical considerations and numerical simulations indicate that spin-kick alignment cannot be easily achieved if the proto-neutron star does not possess some initial angular momentum, contrary to some previous claims. To obtain the observed spin-kick misalignment angle distribution, the initial spin period of the neutron star must be smaller than the kick timescale. Typically, an initial period of a hundred milliseconds or less is required.

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