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Cold HI ejected into the Magellanic Stream
We report the direct detection of cold HI gas in a cloud ejected from the Small Magellanic Cloud (SMC) towards the Magellanic Stream.
The cloud is part of a fragmented shell of HI gas on the outskirts of the SMC. This is the second direct detection of cold HI associated with the Magellanic Stream using absorption. The cold gas was detected using 2... more1-cm HI 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. less
Astronomical and Space Sciences not elsewhere classified
24 May 2019
02 Jun 2019
interstellar medium in and around the Milky Way
interstellar medium of other galaxies
radio lines: ISM
Emission data is sourced from McClure-Griffiths N. M., et al., 2018, Nature Astronomy, 2, 901
Creative Commons Attribution 4.0 International Licence
CSIRO (Australia), Australian National University (Australia)
Dempsey, James; Mcclure-Griffiths, Naomi; Jameson, Katherine (2020): Cold HI ejected into the Magellanic Stream. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO, Australian National University 2020.
The metadata and files (if any) are available to the public.
Australia Telescope National Facility
C3297 - Follow-up observations of HI absorption near the SMC detected by ASKAP
How does dense, cold gas form in the outskirts of galaxies where the gas thins out? In this project we will explore that question, following up on hints of cold neutral hydrogen which showed up in early results from the new ASKAP telescope. We will examine locations surrounding the Small Magellanic Cloud where gas is in the process of being strippe... mored out to join the enormous tail trailing behind the Magellanic Clouds, the Magellanic Stream. less
Australia Telescope Compact Array