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    50 picoarcsec astrometry of pulsar emission

    Access Status
    Open access via publisher
    Authors
    Pen, U-l
    Macquart, Jean-Pierre
    Deller, A
    Brisken, W.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pen, Ue-Li and Macquart, Jean-Pierre and Deller, Adam T. and Brisken, Walter. 2014. 50 picoarcsec astrometry of pulsar emission. Monthly Notices of the Royal Astronomical Society Letters. 440 (1): pp. L36-L40.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    DOI
    10.1093/mnrasl/slu010
    ISSN
    1745-3925
    URI
    http://hdl.handle.net/20.500.11937/3427
    Collection
    • Curtin Research Publications
    Abstract

    We use very long baseline interferometry (VLBI) imaging of the interstellar scattering speckle pattern associated with the pulsar PSR 0834+06 to measure the astrometric motion of its emission. The D ~ 5 au interstellar baselines, provided by interference between speckles spanning the scattering disc, enable us to detect motions with subnanoarcsecond accuracy. We measure a small pulse deflection of ~18 ± 2 km (not including geometric uncertainties), which is 100 times smaller than the characteristic resolution (λ/D) of this interstellar interferometer. This implies that the emission region is small, and at an altitude of a few hundred km, with the exact value depending on field geometry. This is substantially closer to the star than to the light cylinder. Future VLBI measurements can improve on this finding. This new regime of ultraprecise astrometry may enable precision parallax distance determination of pulsar binary displacements.

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