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Determining Motions and Birthplaces of Pulsars through VLBI Astrometry

Published online by Cambridge University Press:  12 April 2016

T. J. Galama ,
J. Van Paradijs ,
E. P. J. van den Heuvel ,
A. G. de Bruyn ,
R. M. Campbell ,
R. C. Vermeulen ,
J.-F. Lestrade ,
F. Verbunt  and
R. T. Schilizzi
T. J. Galama
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/ CHEAF, University of Amsterdam, Amsterdam, The Netherlands
J. Van Paradijs
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/ CHEAF, University of Amsterdam, Amsterdam, The Netherlands
E. P. J. van den Heuvel
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/ CHEAF, University of Amsterdam, Amsterdam, The Netherlands
A. G. de Bruyn
Affiliation:
NFRA, Radio Observatory, Dwingeloo, The Netherlands
R. M. Campbell
Affiliation:
NFRA, Radio Observatory, Dwingeloo, The Netherlands
R. C. Vermeulen
Affiliation:
NFRA, Radio Observatory, Dwingeloo, The Netherlands
J.-F. Lestrade
Affiliation:
Observatoire de Paris, Paris, France
F. Verbunt
Affiliation:
Astronomical Institute Utrecht, Utrecht, The Netherlands
R. T. Schilizzi
Affiliation:
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, The Netherlands

Abstract

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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.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 391 - 392
Copyright
Copyright © Astronomical Society of the Pacific 1998

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