New candidate radio supernova remnants detected in the GLEAM survey over 345° < l < 60°, 180° < l < 240°
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°.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- November 2019
- DOI:
- 10.1017/pasa.2019.34
- arXiv:
- arXiv:1911.08126
- Bibcode:
- 2019PASA...36...45H
- 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
- E-Print:
- 34 pages, 83 figures, 2 tables, accepted to PASA