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

    No Low-frequency Emission from Extremely Bright Fast Radio Bursts

    Access Status
    Fulltext not available
    Authors
    Sokolowski, Marcin
    Bhat, Ramesh
    Macquart, Jean-Pierre
    Shannon, Ryan
    Bannister, K.
    Ekers, Ronald
    Scott, D.
    Beardsley, A.
    Crosse, B.
    Emrich, David
    Franzen, Thomas
    Gaensler, B.
    Horsley, L.
    Johnston-Hollitt, M.
    Kaplan, D.
    Kenney, David
    Morales, M.
    Pallot, D.
    Sleap, G.
    Steele, K.
    Tingay, Steven
    Trott, Cathryn
    Walker, M.
    Wayth, Randall
    Williams, Andrew
    Wu, C.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sokolowski, M. and Bhat, R. and Macquart, J. and Shannon, R. and Bannister, K. and Ekers, R. and Scott, D. et al. 2018. No Low-frequency Emission from Extremely Bright Fast Radio Bursts. Astrophysical Journal Letters. 867 (1).
    Source Title
    Astrophysical Journal Letters
    DOI
    10.3847/2041-8213/aae58d
    ISSN
    2041-8205
    School
    Curtin Institute of Radio Astronomy (Physics)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100857
    URI
    http://hdl.handle.net/20.500.11937/73315
    Collection
    • Curtin Research Publications
    Abstract

    © 2018. The American Astronomical Society. All rights reserved. We present the results of a coordinated campaign conducted with the Murchison Widefield Array (MWA) to shadow fast radio bursts (FRBs) detected by the Australian Square Kilometre Array Pathfinder (ASKAP) at 1.4 GHz, which resulted in simultaneous MWA observations of seven ASKAP FRBs. We de-dispersed the 24 ×1.28 MHz MWA images across the 170-200 MHz band taken at 0.5 s time resolution at the known dispersion measures (DMs) and arrival times of the bursts and searched both within the ASKAP error regions (typically ~10' ×10'), and beyond (4° ×4°). We identified no candidates exceeding a 5s threshold at these DMs in the dynamic spectra. These limits are inconsistent with the mean fluence scaling of a = -1.8 ±0.3 (F? ? ? a, where ? is the observing frequency) that is reported for ASKAP events, most notably for the three high-fluence (F1.4 GHz ? 100 Jy ms) FRBs 171020, 180110, and 180324. Our limits show that pulse broadening alone cannot explain our non-detections, and that there must be a spectral turnover at frequencies above 200 MHz. We discuss and constrain parameters of three remaining plausible spectral break mechanisms: free-free absorption, intrinsic spectral turnover of the radiative processes, and magnification of signals at ASKAP frequencies by caustics or scintillation. If free-free absorption were the cause of the spectral turnover, we constrain the thickness of the absorbing medium in terms of the electron temperature, T, to <0.03 (T/104 K)-1.35 pc for FRB 171020.

    Related items

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

    • The spectral variability of the GHz-peaked spectrum radio source PKS 1718-649 and a comparison of absorption models
      Tingay, Steven; Macquart, Jean-Pierre; Collier, J.; Rees, G.; Callingham, J.; Stevens, J.; Carretti, E.; Wayth, Randall; Wong, G.; Trott, C.; McKinley, B.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Corey, B.; Deshpande, A.; Emrich, D.; Gaensler, B.; Goeke, R.; Greenhill, L.; Hazelton, B.; Johnston-Hollitt, M.; Kaplan, D.; Kasper, J.; Kratzenberg, E.; Lonsdale, C.; Lynch, Mervyn; McWhirter, S.; Mitchell, D.; Morales, M.; Morgan, E.; Oberoi, D.; Ord, Stephen; Prabu, T.; Rogers, A.; Roshi, A.; Shankar, N.; Srivani, K.; Subrahmanyan, R.; Waterson, M.; Webster, R.; Whitney, A.; Williams, A.; Williams, C. (2015)
      Using the new wideband capabilities of the ATCA, we obtain spectra for PKS 1718-649, a well-known gigahertzpeaked spectrum radio source. The observations, between approximately 1 and 10 GHz over 3 epochs spanning approximately ...
    • Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars
      Allison, J.; Moss, V.; Macquart, Jean-Pierre; Curran, S.; Duchesne, S.; Mahony, E.; Sadler, E.; Whiting, M.; Bannister, K.; Chippendale, A.; Edwards, P.; Harvey-Smith, L.; Heywood, I.; Indermuehle, B.; Lenc, E.; Marvil, J.; McConnell, D.; Sault, R. (2017)
      Using the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP BETA), we have carried out the first z = 0-1 survey for HI and OH absorption towards the gravitationally lensed quasars ...
    • Broadband spectral modeling of the extreme gigahertz-peaked spectrum radio source PKS B0008-421
      Callingham, J.; Gaensler, B.; Ekers, R.; Tingay, Steven; Wayth, Randall; Morgan, J.; Bernardi, G.; Bell, M.; Bhat, R.; Bowman, J.; Briggs, F.; Cappallo, R.; Deshpande, A.; Ewall-Wice, A.; Feng, L.; Greenhill, L.; Hazelton, B.; Hindson, L.; Hurley-Walker, N.; Jacobs, D.; Johnston-Hollitt, M.; Kaplan, D.; Kudrayvtseva, N.; Lenc, E.; Lonsdale, C.; McKinley, B.; McWhirter, S.; Mitchell, D.; Morales, M.; Morgan, E.; Oberoi, D.; Offringa, A.; Ord, S.; Pindor, B.; Prabu, T.; Procopio, P.; Riding, J.; Srivani, K.; Subrahmanyan, R.; Shankar, N.; Webster, R.; Williams, A.; Williams, C. (2015)
      We present broadband observations and spectral modeling of PKS B0008-421 and identify it as an extreme gigahertz-peaked spectrum (GPS) source. PKS B0008-421 is characterized by the steepest known spectral slope below the ...
    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.