On the accurate positioning of Geminga

Details On the accurate positioning of Geminga On the accurate positioning of Geminga

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..573c&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 573-577 (1997).

Physics

Pulsars, Neutron Stars, Astrometry And Reference Systems

Scientific paper

Accuracy in the absolute position in the sky is one of the limiting factors for pulsar timing, and timing parameters have a direct impact on the understanding of the physics of Isolated Neutron Stars (INS). This is particularly true for Geminga, the only example of radio silent neutron star known so far. We have combined the Hipparcos and Tycho catalogues, ground-based astrometric data, and Hubble Space Telescope (HST) Wide Field Planetary Camera (WFPC2) images, to yield for the mv=25.5 optical counterpart of Geminga a~40 mas (per coordinate) uncertainty. Such a positional accuracy, unprecedented for the optical position of an object this faint, is needed to combine in phase γ-ray photons collected over more than 20 years, i.e. over 2.5 billions of the star's revolutions.

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