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    Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies

    Access Status
    Fulltext not available
    Authors
    Meyers, B.
    Tremblay, S.
    Bhat, Ramesh
    Flynn, C.
    Gupta, V.
    Shannon, Ryan
    Murray, Steven
    Sobey, Charlotte
    Ord, S.
    Oslowski, S.
    Crosse, B.
    Williams, Andrew
    Jankowski, F.
    Farah, W.
    Krishnan, V.
    Bateman, T.
    Bailes, M.
    Beardsley, A.
    Emrich, David
    Franzen, Thomas
    Gaensler, B.
    Horsley, L.
    Johnston-Hollitt, M.
    Kaplan, D.
    Kenney, David
    Morales, M.
    Pallot, D.
    Steele, K.
    Tingay, Steven
    Trott, Cathryn
    Walker, M.
    Wayth, Randall
    Wu, C.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Meyers, B. and Tremblay, S. and Bhat, R. and Flynn, C. and Gupta, V. and Shannon, R. and Murray, S. et al. 2018. Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies. Astrophysical Journal. 869 (2): Article ID 134.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/aaee7b
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/74533
    Collection
    • Curtin Research Publications
    Abstract

    Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal low-frequency (?300 MHz) coverage. We present the first low-frequency detection of the intermittent pulsar J1107-5907 with the Murchison Widefield Array (MWA) at 154 MHz and the simultaneous detection from the recently upgraded Molonglo Observatory Synthesis Telescope (UTMOST) at 835 MHz, as part of an ongoing observing campaign. During a 30 minute simultaneous observation, we detected the pulsar in its bright emission state for approximately 15 minutes, where 86 and 283 pulses were detected above a signal-to-noise threshold of 6 with the MWA and UTMOST, respectively. Of the detected pulses, 51 had counterparts at both frequencies and exhibited steep spectral indices for both the bright main pulse component and the precursor component. We find that the bright state pulse energy distribution is best parameterized by a log-normal distribution at both frequencies, contrary to previous results that suggested a power law distribution. Further low-frequency observations are required in order to explore in detail aspects such as pulse-to-pulse variability and intensity modulations, as well as to better constrain the signal propagation effects due to the interstellar medium and intermittency characteristics at these frequencies. The spectral index, extended profile emission covering a large fraction of pulse longitude, and the broadband intermittency of PSR J1107-5907 suggest that future low-frequency pulsar searches - for instance, those planned with SKA-Low - will be in an excellent position to find and investigate new pulsars of this type.

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