Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..113h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 113-124.
Astronomy and Astrophysics
Astronomy
159
Astrometry, Pulsars, Stellar Motions, Radial Velocity, Radio Astronomy, Stellar Evolution, Stellar Magnetic Fields, Very Long Base Interferometry
Scientific paper
A program of observations to measure the proper motions of 44 pulsars has been carried out over a four-year period, yielding 31 determinations of proper motion and 13 upper limits. Observations were carried out with two interferometers of the MERLIN radio synthesis instrument at 408 MHz. By wide-field phase referencing to multiple sources within the primary beam of the instrument, accurate positions of each pulsar relative to its reference sources have been determined for a number of epochs. The change in the measured position with epoch results in the determination of the proper motion of the pulsar. The new measurements double the number of interferometrically measured proper motions and reinforce the view that pulsars form a population of high-velocity objects that appear to be migrating from the galactic plane. The new kinetic age determinations also support the conclusion that the magnetic fields of pulsars decay on time-scales of a few million years.
Anderson Brandon
Harrison A. P.
Lyne Andrew G.
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