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    On the search for coherent radiation from radio pulsars

    134624_17582_A9RE0.tmp.pdf (224.8Kb)
    Access Status
    Open access
    Authors
    Smits, J.
    Stappers, B.
    Macquart, Jean-pierre
    Ramachandran, R.
    Kuijpers, J.
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Smits, J. M. and Stappers, B. W. and Macquart, J. P. and Ramachandran, R. and Kuijpers, J. 2003. On the search for coherent radiation from radio pulsars. Astronomy and Astrophysics. 405 (3): pp. 795-801.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361:20030699
    ISSN
    0004-6361
    Faculty
    Faculty of Science and Engineering
    Curtin Institute of Radio Astronomy
    Remarks

    © INRA, EDP Sciences, 2003

    URI
    http://hdl.handle.net/20.500.11937/4355
    Collection
    • Curtin Research Publications
    Abstract

    We have examined data from pulsars B0950+08 and B0329+54 for evidence of temporally coherent radiation using the modified coherence function (MCF) technique of Jenet et al. (2001). We consider the influence of both instrumental bandpass and interstellar propagation effects. Even after removal of the effects due to the instrumental bandpass, we detect a signature in the MCF of our PSR B0329+54 data which is consistent with the definition of a coherent signal. However, we model the effects due to interstellar scintillation for this pulsar and show that it reproduces the observed signature. In particular, the temporal coherence time is close to the reciprocal of the decorrelation bandwidth due to diffractive scintillation. Furthermore, comparison of the coherence times of three pulsars reported by Jenet et al. (2001) with their expected diffractive decorrelation bandwidths suggests that the detection of coherence in these pulsars is also likely a result of interstellar scintillation, and is not intrinsic to the pulsars.

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