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    A study of multifrequency polarization pulse profiles of millisecond pulsars

    Access Status
    Fulltext not available
    Authors
    Dai, S.
    Hobbs, G.
    Manchester, R.
    Kerr, M.
    Shannon, Ryan
    van Straten, W.
    Mata, A.
    Bailes, M.
    Bhat, N.
    Burke-Spolaor, S.
    Coles, W.
    Johnston, S.
    Keith, M.
    Levin, Y.
    Oslowski, S.
    Reardon, D.
    Ravi, V.
    Sarkissian, J.
    Tiburzi, C.
    Toomey, L.
    Wang, H.
    Wang, J.
    Wen, L.
    Xu, R.
    Yan, W.
    Zhu, X.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Dai, S. and Hobbs, G. and Manchester, R. and Kerr, M. and Shannon, R. and van Straten, W. and Mata, A. et al. 2015. A study of multifrequency polarization pulse profiles of millisecond pulsars. Monthly Notices of the Royal Astronomical Society. 449 (3): pp. 3223-3262.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv508
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/8108
    Collection
    • Curtin Research Publications
    Abstract

    We present high signal-to-noise ratio, multifrequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20-cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre- and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a λ2 relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.

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