Cold HI ejected into the Magellanic Stream

Abstract

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 21-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 $68\pm 20$ 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.

9 pages, 5 figures, accepted for publication in MNRAS

References in corpus (42)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Neutral Atomic Phases of the ISM in the Galaxy
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds
• GASS: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• Thermal condensation in a turbulent atomic hydrogen flow
• The Australia Telescope Compact Array Broadband Backend (CABB)
• The Magellanic Stream, High-Velocity Clouds and the Sculptor Group
• Star Formation in Galaxy Mergers with Realistic Models of Stellar Feedback & the Interstellar Medium
• The Origin of the Magellanic Stream and Its Leading Arm
• Simulations of the Magellanic Stream in a First Infall Scenario
• The Parkes HI Survey of the Magellanic System
• Compact continuum source-finding for next generation radio surveys
• The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries
• Source finding in the era of the SKA (precursors): Aegean 2.0
• The Millennium Arecibo 21-cm Absorption Line Survey. I. Techniques and Gaussian Fits
• The 200 Degree-Long Magellanic Stream System
• The Magellanic Stream: Circumnavigating the Galaxy
• GASS: The Parkes Galactic All-Sky Survey. Update: improved correction for instrumental effects and new data release
• The Spin Temperature of Warm Interstellar H I
• Formation of Cavities, Filaments, and Clumps by the Non-linear Development of Thermal and Gravitational Instabilities in the Interstellar Medium under Stellar Feedback
• GASKAP -- The Galactic ASKAP Survey
• The COS/UVES Absorption Survey of the Magellanic Stream: II. Evidence for a complex enrichment history of the Stream from the Fairall 9 sightline
• Autonomous Gaussian Decomposition
• GaussPy+: A fully automated Gaussian decomposition package for emission line spectra
• The COS/UVES Absorption Survey of the Magellanic Stream: I. One-Tenth Solar Abundances along the Body of the Stream
• ATPMN: accurate positions and flux densities at 5 and 8 GHz for 8,385 sources from the PMN survey
• The many streams of the Magellanic Stream
• Cold gas outflows from the Small Magellanic Cloud traced with ASKAP
• Evolved Massive Stars at Low-metallicity I. A Source Catalog for the Small Magellanic Cloud
• On the Properties of the HI shells in the Small Magellanic CLoud
• Warm Ionized Gas Revealed in the Magellanic Bridge Tidal Remnant: Constraining the Baryon Content and the Escaping Ionizing Photons around Dwarf Galaxies
• Recovering interstellar gas properties with HI spectral lines: A comparison between synthetic spectra and 21-SPONGE
• The Magellanic Stream and Debris Clouds
• Physical properties of two compact high-velocity clouds possibly associated with the Leading Arm of the Magellanic System
• An ATCA Survey of HI Absorption in the Magellanic Clouds I: HI Gas Temperature Measurements in the Small Magellanic Cloud
• The Fate of Supernova-Heated Gas in Star-Forming Regions of the LMC: Lessons for Galaxy Formation?
• Molecular gas in the outflow of the Small Magellanic Cloud
• The Diffuse Ionized Gas Halo of the Small Magellanic Cloud
• Cool Gas in the Magellanic Stream
• The Distance and Properties of Hydrogen Clouds in the Leading Arm of the Magellanic System

Cited by in corpus (6)

• GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud
• GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud
• GASKAP Pilot Survey Science II: ASKAP Zoom Observations of Galactic 21-cm Absorption
• A neutral hydrogen absorption study of cold gas in the outskirts of the Magellanic Clouds using the GASKAP-HI survey
• A Search for 3-mm Molecular Absorption Line Transitions in the Magellanic Stream
• The MACH HI absorption survey I: Physical conditions of cold atomic gas outside of the Galactic plane