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Determining Motions and Birthplaces of Pulsars through VLBI Astrometry

  • T. J. Galama (a1), J. Van Paradijs (a1), E. P. J. van den Heuvel (a1), A. G. de Bruyn (a2), R. M. Campbell (a2), R. C. Vermeulen (a2), J.-F. Lestrade (a3), F. Verbunt (a4) and R. T. Schilizzi (a5)...

Abstract

We present first results of global VLBI astrometric pulsar parallax and proper motion measurements (phase-reference). The aim is to obtain information on pulsar motions and pulsar birthplaces. Proper motions could provide answers to questions like: How large are pulsar velocities at birth? How are these velocities produced and what is the final galactic pulsar distribution? Identification of birthplaces (with, e.g., an OB-association) provides information on the pulsar progenitor population (the fraction of pulsars born in binaries; the mass range of the progenitors etc.). We have a first epoch on three pulsars, selected on the basis of age (young < 3 Myr), flux density (relatively strong) and presence in the solar neighborhood (d < 3 kpc). Gating increases the SNR by typically a factor of 5.

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References

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Alef, W. 1987, Ph.D. Thesis, Bonn.
Campbell, R.M. et al. 1996. ApJ, 461, L9598.
Hartman, J.-W. et al. 1997. A&A, 461, 698712.
Lestrade, J.F. et al. 1992. A&A, 258, L112115.
Lorimer, D.R. et al. 1995. MNRAS, 273, 411421.

Determining Motions and Birthplaces of Pulsars through VLBI Astrometry

  • T. J. Galama (a1), J. Van Paradijs (a1), E. P. J. van den Heuvel (a1), A. G. de Bruyn (a2), R. M. Campbell (a2), R. C. Vermeulen (a2), J.-F. Lestrade (a3), F. Verbunt (a4) and R. T. Schilizzi (a5)...

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