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EMU detection of a large and low surface brightness galactic SNR G288.8–6.3

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DOIResolve DOI: https://doi.org/10.3847/1538-3881/acf19c
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-4990-9288; Search for: ORCID identifier: https://orcid.org/0000-0002-9618-2499; Search for: ORCID identifier: https://orcid.org/0000-0002-8036-4132; Search for: ORCID identifier: https://orcid.org/0000-0002-5119-4808; Search for: ORCID identifier: https://orcid.org/0000-0002-8312-6930; Search for: ORCID identifier: https://orcid.org/0000-0003-1173-6964; Search for: ORCID identifier: https://orcid.org/0000-0003-2062-5692; Search for: ORCID identifier: https://orcid.org/0000-0003-0665-0939; Search for: ORCID identifier: https://orcid.org/0000-0002-4939-734X; Search for: ORCID identifier: https://orcid.org/0000-0002-6097-2747; Search for: ORCID identifier: https://orcid.org/0000-0001-5609-7372; Search for: ORCID identifier: https://orcid.org/0000-0002-4934-7422; Search for: ORCID identifier: https://orcid.org/0000-0002-7703-0692; Search for: 1ORCID identifier: https://orcid.org/0009-0003-2088-9433; Search for: ORCID identifier: https://orcid.org/0000-0002-3429-2481; Search for: ORCID identifier: https://orcid.org/0000-0002-7239-2248; Search for: ORCID identifier: https://orcid.org/0000-0001-5197-1091; Search for: ORCID identifier: https://orcid.org/0000-0001-5310-1022; Search for: ORCID identifier: https://orcid.org/0000-0002-0107-5237; Search for: ORCID identifier: https://orcid.org/0000-0002-3137-473X; Search for: ORCID identifier: https://orcid.org/0000-0002-5289-5729; Search for: ORCID identifier: https://orcid.org/0000-0001-6872-2358; Search for: ORCID identifier: https://orcid.org/0000-0003-4351-993X; Search for: 1ORCID identifier: https://orcid.org/0000-0001-5953-0100; Search for: ORCID identifier: https://orcid.org/0000-0001-6109-8548; Search for: ORCID identifier: https://orcid.org/0000-0002-5449-6131; Search for: ORCID identifier: https://orcid.org/0000-0002-9516-1581; Search for: ORCID identifier: https://orcid.org/0000-0002-4814-958X; Search for: ORCID identifier: https://orcid.org/0000-0001-5126-1719; Search for: ORCID identifier: https://orcid.org/0000-0003-1584-5930; Search for: ORCID identifier: https://orcid.org/0000-0001-8534-6788; Search for: ORCID identifier: https://orcid.org/0000-0002-4597-1906; Search for: ORCID identifier: https://orcid.org/0000-0001-6368-8330; Search for: ORCID identifier: https://orcid.org/0000-0001-5302-1866; Search for: ORCID identifier: https://orcid.org/0000-0002-0338-9539; Search for: ORCID identifier: https://orcid.org/0000-0002-1216-7831; Search for: ORCID identifier: https://orcid.org/0000-0002-6972-8388; Search for: ORCID identifier: https://orcid.org/0000-0001-7093-3875; Search for: ORCID identifier: https://orcid.org/0000-0001-9393-8863
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FormatText, Article
Subjectsupernova remnants; radio astronomy
Abstract
We present the serendipitous detection of a new Galactic supernova remnant (SNR), G288.8–6.3, using data from the Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) survey. Using multifrequency analysis, we confirm this object as an evolved Galactic SNR at high Galactic latitude with low radio surface brightness and typical SNR spectral index of α = − 0.41 ± 0.12. To determine the magnetic field strength in SNR G288.8–6.3, we present the first derivation of the equipartition formulae for SNRs with spectral indices α > − 0.5. The angular size is 1fdg8 × 1fdg6 (107farcm6 × 98farcm4), and we estimate that its intrinsic size is ∼40 pc, which implies a distance of ∼1.3 kpc and a position of ∼140 pc above the Galactic plane. This is one of the largest in angular size and closest Galactic SNRs. Given its low radio surface brightness, we suggest that it is about 13,000 yr old.
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PublisherIOP
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  • The Astronomical Journal 166, no. 4, 149 (1 October 2023).
LanguageEnglish
Peer reviewedYes
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Record identifier1da95a98-2c61-4115-b897-4c69a4ba03f5
Record created2024-06-03
Record modified2024-06-03
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