A Catalogue of Radio Supernova Remnants and Candidate Supernova Remnants in the EMU/POSSUM Galactic Pilot Field

Abstract

We use data from the pilot observations of the EMU/POSSUM surveys to study the "missing supernova remnant (SNR) problem", the discrepancy between the number of Galactic SNRs that have been observed and the number that are estimated to exist. The Evolutionary Map of the Universe (EMU) and the Polarization Sky Survey of the Universe's Magnetism (POSSUM) are radio sky surveys that are conducted using the Australian Square Kilometre Array Pathfinder (ASKAP). We report on the properties of 7 known SNRs in the joint Galactic pilot field, with an approximate longitude and latitude of 323${}^{\circ }\le$ l $\le$ 330${}^{\circ }$ and -4${}^{\circ }\le$ b $\le$ 2${}^{\circ }$ respectively, and identify 21 SNR candidates. Of these, 4 have been previously identified as SNR candidates, 3 were previously listed as a single SNR, 13 have not been previously studied, and 1 has been studied in the infrared. These are the first discoveries of Galactic SNR candidates with EMU/POSSUM and, if confirmed, they will increase the SNR density in this field by a factor of 4. By comparing our SNR candidates to the known Galactic SNR population, we demonstrate that many of these sources were likely missed in previous surveys due to their small angular size and/or low surface brightness. We suspect that there are SNRs in this field that remain undetected due to limitations set by the local background and confusion with other radio sources. The results of this paper demonstrate the potential of the full EMU/POSSUM surveys to uncover more of the missing Galactic SNR population.

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Cited by in corpus (12)

• Supernova Remnant Candidates Discovered by the SARAO MeerKAT Galactic Plane Survey
• ASKAP$-$EMU Discovery of "Raspberry": a new Galactic SNR Candidate G308.73+1.38
• Fast as Potoroo: Radio Continuum Detection of a Bow-Shock Pulsar Wind Nebula Powered by Pulsar J1638-4713
• A Catalog of Galactic Supernova Remnants and Supernova Remnant Candidates from the EMU/POSSUM Radio Sky Surveys. I
• The SARAO MeerKAT Galactic Plane Survey extended source catalogue
• Supernova remnant candidates identified using MWA Galactic Plane Monitoring over 285deg < l < 70deg and |b| < 16deg
• Cosmological Zoom-In Simulation of Odd Radio Circles as Merger-Driven Shocks in Galaxy Groups
• New supernova remnant candidates in the LOFAR Two Metre Sky Survey
• Radio detection of supernova remnant G310.7-5.4 with $\gamma$-ray counterpart: Abeona SNR
• MeerKAT discovery of 164 compact radio rings toward the Galactic Plane
• Heavy interstellar scattering toward the near end of the Galactic bar
• A newly born spider system at the core of a radio shell: Evidence for a low-energy supernova