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

Hurley-Walker, N., Filipović, M. D., Gaensler, B. M., Leahy, D. A., Hancock, P. J., Franzen, T. M. O., Offringa, A. R., Callingham, J. R., Hindson, L., Wu, C., Bell, M. E., For, B. -Q., Johnston-Hollitt, M., Kapińska, A. D., Morgan, J., Murphy, T., McKinley, B., Procopio, P., Staveley-Smith, L., Wayth, R. B. & Zheng, Q., 1-Jan-2019, In : Publications of the Astronomical Society of Australia. 36, 33 p., 045.

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  • New candidate radio supernova remnants detected in the GLEAMsurvey over 345◦<l<60◦, 180◦<l<240◦

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  • 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. Wayth
  • Q. Zheng
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
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

ID: 119379828