Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..429n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 1, p. 429-435
Other
45
Pulsars, Stellar Motions, Velocity Distribution, X Ray Binaries, Astrometry, Chronology, Kinematics, Mathematical Models
Scientific paper
Timing observations of millisecond pulsars PSR J2019+2425 and PSR J2322+2057 made over more than 2 years have yielded spin-down, astrometric, and binary parameters. The proper motions of these sources are 23.5 +/- 1.3 and 25 +/- 3 mas/yr, respectively, corresponding to transverse velocities of approximately 100 and 90 km/s. These measurements, combined with other published millisecond pulsar proper motions, indicate that the population has a velocity dispersion of order 60 km/s, comparable to that of low-mass X-ray binaries (from which millisecond pulsars evolve) but much lower than that of normal (non-millisecond) pulsars. The spin-down rates of J2019+2425 and J2322+2057 are extraordinarily low and, when biases induced by motion are removed, formal calculations yield ages of 27 x 109 and 19 x 109 yr, respectively, indicating they have evolved little since becoming millisecond pulsars.
Nice David J.
Taylor Joseph H. Jr.
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