Pulsar proper motions, velocities and lifetimes

Details Pulsar proper motions, velocities and lifetimes Pulsar proper motions, velocities and lifetimes

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..357h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 357-368. Research supported by the Yale University O

Astronomy and Astrophysics

Astronomy

20

Astrodynamics, Pulsars, Stellar Evolution, Stellar Motions, High Speed, Kinematics, Statistical Analysis

Scientific paper

This paper demonstrates how proper-motion distribution theory can be applied to pulsar proper-motion observations to yield a nearly unbiased estimate of pulsar velocity dispersion, which in turn can be used to correct pulsar age and birth-rate calculations for proper-motion bias. A quantitative example of proper-motion bias is given, proper-motion data and calculated transverse velocities are presented for 16 pulsars, and the pulsar proper-motion distribution is considered. It is shown that: (1) the existing incomplete pulsar proper-motion data are strongly biased toward high proper motions and velocities; (2) the proper-motion distribution method yields a best estimate for the pulsar velocity dispersion of 70 + or - 15 km/s for the distance scale defined by an adopted mean electron density of 0.03 per cu cm; and (3) recalculations of kinematic ages, local birth rates, and galactic pulsar birth intervals based on the lower pulsar velocity estimates can greatly diminish or entirely remove the discrepancies between kinematic and characteristic ages, local pulsar birth rates and massive-star death rates, and galactic pulsar birth rates and supernova occurrence-rate estimates.

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