Proper Motion of the Crab Pulsar Revisited

Details Proper Motion of the Crab Pulsar Revisited Proper Motion of the Crab Pulsar Revisited

2006-02-11

arxiv.org/abs/astro-ph/0602255v1

Astrophys.J. 644 (2006) 445-450

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, accepted for publication in ApJ

Scientific paper

10.1086/503315

It has been suggested that the Crab pulsar's proper motion is well aligned with the symmetry axis of the pulsar wind nebula. We have re-visited this question, examining over 6 years of F547M WFPC2 chip 3 images to obtain a best-fit value of $\mu_\ast = 14.9 \pm 0.8$mas/yr at PA $278\arcdeg \pm 3\arcdeg$. At $26\arcdeg\pm 3\arcdeg$ to the nebula axis, this substantially relaxes constraints on the birth kick of this pulsar. Such misalignment allows the momentum to be imparted over $\sim$1s timescales.

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