A catalogue of radio supernova remnants and candidate supernova remnants in the EMU/POSSUM Galactic pilot field

Author:

Ball Brianna D1ORCID,Kothes Roland1,Rosolowsky Erik1ORCID,West Jennifer23ORCID,Becker Werner45ORCID,Filipović Miroslav D6ORCID,Gaensler B M3ORCID,Hopkins Andrew M7ORCID,Koribalski Bärbel68ORCID,Landecker Tom2ORCID,Leahy Denis9ORCID,Marvil Joshua10ORCID,Sun Xiaohui11ORCID,Bufano Filomena12ORCID,Carretti Ettore13ORCID,Ingallinera Adriano12ORCID,Van Eck Cameron L14ORCID,Willis Tony2ORCID

Affiliation:

1. Department of Physics, University of Alberta , 4-181 CCIS , Edmonton, Alberta T6G 2E1, Canada

2. Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics, National Research Council Canada , P.O. Box 248 , Penticton, BC V2A 6J9, Canada

3. Dunlap Institute for Astronomy and Astrophysics, University of Toronto , 60 St. George Street , Toronto M5S 3H4, Canada

4. Max-Planck-Institut für Extraterrestrische Physik , Gießenbachstraße 1, 85748 Garching, Germany

5. Max-Planck-Institut für Radioastronomie , Auf dem Hügel 69, 53121 Bonn, Germany

6. Physical Sciences, Western Sydney University , Locked Bag 1797 , Penrith South DC, Sydney, NSW 1797, Australia

7. Australian Astronomical Optics, Macquarie University , 105 Delhi Rd , North Ryde, NSW 2113, Australia

8. Australia Telescope National Facility, CSIRO Astronomy and Space Science , P.O. Box 76, NSW 1710, NSW 1710 , Epping, Australia

9. Department of Physics and Astronomy, University of Calgary , 2500 University Drive NW , Calgary, AB T2N 1N4, Canada

10. National Radio Astronomy Observatory , 1003 Lopezville Road , P.O. Box O, Socorro, NM 87801, USA

11. School of Physics and Astronomy, Yunnan University , Kunming 650500 , PR China

12. INAF – Osservatorio Astrofisico di Catania , Via Santa Sofia, 78, 95123 Catania, Italy

13. INAF, Istituto di Radioastronomia , Via Gobetti 101, 40129 Bologna, Italy

14. Research School of Astronomy and Astrophysics, The Australian National University , Canberra ACT 2611 , Australia

Abstract

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 seven known SNRs in the joint Galactic pilot field, with an approximate longitude and latitude of 323° ≤ l ≤ 330° and −4° ≤ b ≤ 2°, respectively, and identify 21 SNR candidates. Of these, four have been previously identified as SNR candidates, three were previously listed as a single SNR, 13 have not been previously studied, and one 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.

Funder

NSERC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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