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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., Matsuura, M., Priestley, F., Barlow, M. J., De Looze, I., Papageorgiou, A., Marsh, K., Smith, M. W. L., Noriega-Crespo, A., Rho, J. and Dunne, L. 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: 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: 06 Jan 2022 09:14

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