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    A Census of Southern Pulsars at 185 MHz

    258731.pdf (2.251Mb)
    Access Status
    Open access
    Authors
    Xue, M.
    Bhat, Ramesh
    Tremblay, S.
    Ord, S.
    Sobey, Charlotte
    Swainston, N.
    Kaplan, D.
    Johnston, S.
    Meyers, B.
    McSweeney, S.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Xue, M. and Bhat, R. and Tremblay, S. and Ord, S. and Sobey, C. and Swainston, N. and Kaplan, D. et al. 2017. A Census of Southern Pulsars at 185 MHz. Publications of the Astronomical Society of Australia. 34: Article ID e070.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2017.66
    ISSN
    1323-3580
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    © Astronomical Society of Australia 2017; published by Cambridge University Press.

    URI
    http://hdl.handle.net/20.500.11937/61576
    Collection
    • Curtin Research Publications
    Abstract

    The Murchison Widefield Array, and its recently developed Voltage Capture System, facilitates extending the low-frequency range of pulsar observations at high-time and -frequency resolution in the Southern Hemisphere, providing further information about pulsars and the ISM. We present the results of an initial time-resolved census of known pulsars using the Murchison Widefield Array. To significantly reduce the processing load, we incoherently sum the detected powers from the 128 Murchison Widefield Array tiles, which yields ~10% of the attainable sensitivity of the coherent sum. This preserves the large field-of-view (~450 deg 2 at 185 MHz), allowing multiple pulsars to be observed simultaneously. We developed a WIde-field Pulsar Pipeline that processes the data from each observation and automatically folds every known pulsar located within the beam. We have detected 50 pulsars to date, 6 of which are millisecond pulsars. This is consistent with our expectation, given the telescope sensitivity and the sky coverage of the processed data (~17 000 deg 2 ). For 10 pulsars, we present the lowest frequency detections published. For a subset of the pulsars, we present multi-frequency pulse profiles by combining our data with published profiles from other telescopes. Since the Murchison Widefield Array is a low-frequency precursor to the Square Kilometre Array, we use our census results to forecast that a survey using the low-frequency component of the Square Kilometre Array Phase 1 can potentially detect around 9 400 pulsars.

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