The Pulsar Kick Velocity Distribution

Details The Pulsar Kick Velocity Distribution The Pulsar Kick Velocity Distribution

1997-08-07

arxiv.org/abs/astro-ph/9708071v1

Mon.Not.Roy.Astron.Soc. 291 (1997) 569

Astronomy and Astrophysics

Astrophysics

Latex, 10 pages, and 11 postscript figures. Accepted by Monthly Notices

Scientific paper

We analyse the sample of pulsar proper motions, taking detailed account of the selection effects of the original surveys. We treat censored data using survival statistics. From a comparison of our results with Monte Carlo simulations, we find that the mean birth speed of a pulsar is 250-300 km/s, rather than the 450 km/s foundby Lyne & Lorimer (1994). The resultant distribution is consistent with a maxwellian with dispersion $ \sigma_v = 190 km/s$. Despite the large birth velocities, we find that the pulsars with long characteristic ages show the asymmetric drift, indicating that they are dynamically old. These pulsars may result from the low velocity tail of the younger population, although modified by their origin in binaries and by evolution in the galactic potential.

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