Cold H i ejected into the Magellanic Stream. Issue 1 (8th June 2020)

• Record Type: Journal Article
• Authors: Dempsey, J; McClure-Griffiths, N M; Jameson, K; Buckland-Willis, F
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 496:Issue 1(2020)
• Page Start: 913
• Page End: 920
• Publication Date: 2020-06-08
• Subjects: ISM: clouds -- galaxies: ISM -- Magellanic Clouds -- radio lines: ISM; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa1602
• Languages: English
• ISSNs: 0035-8711

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.