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A galactic dust devil: far-infrared observations of the tornado supernova remnant candidate

Chawner, H., Howard, A. D. P., Gomez, H. L. ORCID:, Matsuura, M. ORCID:, Priestley, F., Barlow, M. J., De Looze, I., Papageorgiou, A., Marsh, K., Smith, M. W. L. ORCID:, Noriega-Crespo, A., Rho, J. and Dunne, L. ORCID: 2020. A galactic dust devil: far-infrared observations of the tornado supernova remnant candidate. Monthly Notices of the Royal Astronomical Society 499 (4) 10.1093/mnras/staa2925

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We present complicated dust structures within multiple regions of the candidate supernova remnant (SNR) the ‘Tornado’ (G357.7−0.1) using observations with Spitzer and Herschel. We use Point Process Mapping, PPMAP, to investigate the distribution of dust in the Tornado at a resolution of 8″, compared to the native telescope beams of 5 − 36″. We find complex dust structures at multiple temperatures within both the head and the tail of the Tornado, ranging from 15 to 60 K. Cool dust in the head forms a shell, with some overlap with the radio emission, which envelopes warm dust at the X-ray peak. Akin to the terrestrial sandy whirlwinds known as ‘Dust Devils’, we find a large mass of dust contained within the Tornado. We derive a total dust mass for the Tornado head of 16.7 M⊙⁠, assuming a dust absorption coefficient of κ300 =0.56m2kg−1⁠, which can be explained by interstellar material swept up by a SNR expanding in a dense region. The X-ray, infra-red, and radio emission from the Tornado head indicate that this is a SNR. The origin of the tail is more unclear, although we propose that there is an X-ray binary embedded in the SNR, the outflow from which drives into the SNR shell. This interaction forms the helical tail structure in a similar manner to that of the SNR W50 and microquasar SS433.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 17 September 2020
Date of Acceptance: 16 September 2020
Last Modified: 22 Jul 2024 17:42

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