New candidate radio supernova remnants detected in the GLEAM survey over 345° < l < 60°, 180° < l < 240°

N. Hurley-Walker*, M. D. Filipović, B. M. Gaensler, D. A. Leahy, P. J. Hancock, T. M. O. Franzen, A. R. Offringa, J. R. Callingham, L. Hindson, C. Wu, M. E. Bell, B. -Q. For, M. Johnston-Hollitt, A. D. Kapińska, J. Morgan, T. Murphy, B. McKinley, P. Procopio, L. Staveley-Smith, R. B. WaythQ. Zheng

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We have detected 27 new supernova remnants (SNRs) using a new data release of the GLEAM survey from the Murchison Widefield Array telescope, including the lowest surface brightness SNR ever detected, G 0.1 - 9.7. Our method uses spectral fitting to the radio continuum to derive spectral indices for 26/27 candidates, and our low-frequency observations probe a steeper spectrum population than previously discovered. None of the candidates have coincident WISE mid-IR emission, further showing that the emission is non-thermal. Using pulsar associations we derive physical properties for six candidate SNRs, finding G 0.1 - 9.7 may be younger than 10 kyr. Sixty per cent of the candidates subtend areas larger than 0.2 deg2 on the sky, compared to < 25% of previously detected SNRs. We also make the first detection of two SNRs in the Galactic longitude range 220°-240°.
Original languageEnglish
Article number045
Number of pages33
JournalPublications of the Astronomical Society of Australia
Volume36
DOIs
Publication statusPublished - 1-Jan-2019

Keywords

  • ISM: individual objects: G 0.1
  • 9.7
  • G 2.1 + 2.7
  • G 7.4 + 0.3
  • G 18.9 - 1.2
  • G 19.1 - 3.1
  • G 19.7 - 0.7
  • G 20.1 - 0.2
  • G 21.8 + 0.2
  • G 23.1 + 0.1
  • G 24.0 - 0.3
  • G 25.3 - 1.8
  • G 28.3 + 0.2
  • G 28.7 - 0.4
  • G 35.3 - 0.0
  • G 230.4 + 1.2
  • G 232.1 + 2.0
  • G 349.1 - 0.8
  • G 350.7 + 0.6
  • G 350.8 + 5.0
  • G 351.0 - 0.6
  • G 351.4 + 0.4
  • G 351.4 + 0.2
  • G 351.9 + 0.1
  • G 353.0 + 0.8
  • G 355.4 + 2.7
  • G 356.5 - 1.9
  • G 358.3 - 0.7
  • ISM: supernova remnants
  • radio continuum: ISM
  • supernovae: general
  • Astrophysics - High Energy Astrophysical Phenomena
  • Astrophysics - Astrophysics of Galaxies

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