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Cold gas outflows from the Small Magellanic Cloud traced with ASKAP

McClure-Griffiths, NM, Denes, H, Dickey, JM ORCID: 0000-0002-6300-7459, Stanimirovic, S, Staveley-Smith, L, Jameson, K, Di Teodoro, E, Allison, JR, Collier, JD, Chippendale, AP, Franzen, T, Gurkan, G, Heald, G, Hotan, A, Kleiner, D, Lee-Waddell, K, McConnell, D, Popping, A, Rhee, J, Riseley, CJ, Voronkov, MA and Whiting, M 2018 , 'Cold gas outflows from the Small Magellanic Cloud traced with ASKAP' , Nature Astronomy, vol. 2, no. 11 , pp. 901-906 , doi: 10.1038/s41550-018-0608-8.

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Feedback from massive stars plays a critical part in the evolution of the Universe by driving powerful outflows from galaxies that enrich the intergalactic medium and regulate star formation. An important source of outflows may be the most numerous galaxies in the Universe: dwarf galaxies. With small gravitational potential wells, these galaxies easily lose their star-forming material in the presence of intense stellar feedback. Here, we show that a nearby dwarf galaxy - the Small Magellanic Cloud - has atomic hydrogen outflows extending at least 2 kiloparsecs from the star-forming bar of the galaxy. The outflows are cold (7 solar masses (that is, about 3 per cent of the total atomic gas of the galaxy). The inferred mass flux in atomic gas alone, ṀH I  ≈ 0.2-1.0 solar masses per year, is up to one order of magnitude greater than the star-formation rate. We suggest that most of the observed outflow will be stripped from the Small Magellanic Cloud through its interaction with its companion, the Large Magellanic Cloud, and the Milky Way, feeding the Magellanic Stream of hydrogen encircling the Milky Way.

Item Type: Article
Authors/Creators:McClure-Griffiths, NM and Denes, H and Dickey, JM and Stanimirovic, S and Staveley-Smith, L and Jameson, K and Di Teodoro, E and Allison, JR and Collier, JD and Chippendale, AP and Franzen, T and Gurkan, G and Heald, G and Hotan, A and Kleiner, D and Lee-Waddell, K and McConnell, D and Popping, A and Rhee, J and Riseley, CJ and Voronkov, MA and Whiting, M
Keywords: radio astronomy
Journal or Publication Title: Nature Astronomy
Publisher: Nature Publishing Group
ISSN: 2397-3366
DOI / ID Number: 10.1038/s41550-018-0608-8
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Copyright 2018 Springer Nature

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