Cold H i ejected into the Magellanic Stream

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 08 Jun 2020Embargo end date: 01 Jan 2020 English Publisher:Oxford University Press (OUP)Journal:Monthly Notices of the Royal Astronomical Society, volume 496, pages 913-920 (issn: 0035-8711, eissn: 1365-2966,

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Authors: J Dempsey; N M McClure-Griffiths; K Jameson; F Buckland-Willis;

doi: 10.1093/mnras/staa1602 , 10.48550/arxiv.2006.01971

arXiv: 2006.01971

Cold H i ejected into the Magellanic Stream

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Abstract

ABSTRACT We report the direct detection of cold H i gas in a cloud ejected from the Small Magellanic Cloud (SMC) towards the Magellanic Stream. The cloud is part of a fragmented shell of H i gas on the outskirts of the SMC. This is the second direct detection of cold H i associated with the Magellanic Stream using absorption. The cold gas was detected using 21-cm H i absorption-line observations with the Australia Telescope Compact Array (ATCA) towards the extra-galactic source PMN J0029−7228. We find a spin (excitation) temperature for the gas of 68 ± 20 K. We suggest that breaking super shells from the Magellanic Clouds may be a source of cold gas to supply the rest of the Magellanic Stream.

Related Organizations

Australian National University
Australia
Commonwealth Scientific and Industrial Research Organisation
Australia

Keywords

Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies

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