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28 March 2024 |
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Hipparcos Positioning of Geminga : How and Why | P. A. Caraveo
; M.G. Lattanzi
; G. Massone
; R. P. Mignani
; V.V. Makarov
; M.A.C. Perryman
; G. F. Bignami
; | Date: |
4 Nov 1997 | Subject: | astro-ph | Affiliation: | 6,1) ( Istituto di Fisica Cosmica del CNR, Milano, Italy Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy Max-Plack-Institute für Extraterrestrische Physik, Garching, Germany Copenhagen University Observatory, Copenhagen, Denmark | Abstract: | 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). We report here on a high-accuracy measurement of the optical position of Geminga (V=25.5), the only known radio-quiet INS. The procedure combines the Hipparcos and Tycho catalogues, ground-based astrometric data,and Hubble Space Telescope (HST) Wide Field Planetary Camera (WFPC2) images, to yield Geminga’s absolute position to within ~40 mas (per coordinate). Such a positional accuracy, unprecedented for the optical position of a pulsar or an object this faint, is needed to combine in phase gamma-ray photons collected over more than 20 years, i.e. over 2.5 billions of star’ revolutions. Although quite a difficult task, this is the only way to improve our knowledge of the timing parameters of this radio silent INS. | Source: | arXiv, astro-ph/9711029 | Services: | Forum | Review | PDF | Favorites |
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