Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array

    Access Status
    Open access via publisher
    Authors
    Bhat, Ramesh
    Ord, S.
    Tremblay, Steven
    Tingay, Steven
    Deshpande, A.
    van Straten, W.
    Oronsaye, S.
    Bernardi, G.
    Bowman, J.
    Briggs, F.
    Cappallo, R.
    Corey, B.
    Emrich, David
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Hewitt, J.
    Johnston-Hollitt, M.
    Kaplan, D.
    Kasper, J.
    Kratzenberg, E.
    Lonsdale, C.
    Lynch, Mervyn
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Prabu, T.
    Rogers, A.
    Roshi, D.
    Udaya-Shankar, N.
    Srivani, K.
    Subrahmanyan, R.
    Waterson, Mark
    Wayth, Randall
    Webster, R.
    Whitney, A.
    Williams, Andrew
    Williams, C.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bhat, R. and Ord, S. and Tremblay, S. and Tingay, S. and Deshpande, A. and van Straten, W. and Oronsaye, S. et al. 2014. The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array. The Astrophysical Journal Letters. 791 (2): pp. L32-1-L32-6.
    Source Title
    The Astrophysical Journal Letters
    DOI
    10.1088/2041-8205/791/2/L32
    ISSN
    2041-8205
    School
    Curtin Institute of Radio Astronomy
    URI
    http://hdl.handle.net/20.500.11937/4732
    Collection
    • Curtin Research Publications
    Abstract

    We report on the detection of the millisecond pulsar PSR J0437−4715 with the Murchison Wide-field Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time–frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of ~80–120 pc from the Sun, in disagreement with a recent claim that the screen is closer (~10 pc). Comparisons with higher frequency data from Parkes reveal a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating the high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity in the detection of nano Hertz gravitational waves via the accurate characterization of ISM effects.

    Related items

    Showing items related by title, author, creator and subject.

    • Pulsar polarisation below 200 MHz: Average profiles and propagation effects
      Noutsos, A.; Sobey, C.; Kondratiev, V.; Weltevrede, P.; Verbiest, J.; Karastergiou, A.; Kramer, M.; Kuniyoshi, M.; Alexov, A.; Breton, R.; Bilous, A.; Cooper, S.; Falcke, H.; Grießmeier, J.; Hassall, T.; Hessels, J.; Keane, E.; Oslowski, S.; Pilia, M.; Serylak, M.; Stappers, B.; Ter Veen, S.; Van Leeuwen, J.; Zagkouris, K.; Anderson, K.; Bähren, L.; Bell, M.; Broderick, J.; Carbone, D.; Cendes, Y.; Coenen, T.; Corbel, S.; Eislöffel, J.; Fender, R.; Garsden, H.; Jonker, P.; Law, C.; Markoff, S.; Masters, J.; Miller-Jones, James; Molenaar, G.; Osten, R.; Pietka, M.; Rol, E.; Rowlinson, A.; Scheers, B.; Spreeuw, H.; Staley, T.; Stewart, A.; Swinbank, J.; Wijers, R.; Wijnands, R.; Wise, M.; Zarka, P.; Van Der Horst, A. (2015)
      Aims: We present the highest-quality polarisation profiles to date of 16 non-recycled pulsars and four millisecond pulsars, observed below 200 MHz with the LOFAR high-band antennas. Based on the observed profiles, we ...
    • A Census of Southern Pulsars at 185 MHz
      Xue, M.; Bhat, Ramesh; Tremblay, S.; Ord, S.; Sobey, Charlotte; Swainston, N.; Kaplan, D.; Johnston, S.; Meyers, B.; McSweeney, S. (2017)
      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, ...
    • A Multifrequency Census of 100 Pulsars below 100 MHz with LWA: A Systematic Study of Flux Density, Spectra, Timing, Dispersion, Polarization, and Its Variation from a Decade of Observations
      Kumar, Pratik ; Taylor, G.B.; Stovall, K.; Dowell, J.; White, S.M. (2025)
      We present a census of 100 pulsars, the largest below 100 MHz, including 94 normal pulsars and six millisecond pulsars, with the Long Wavelength Array (LWA). Pulse profiles are detected across a range of frequencies from ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.