A Detailed GASKAP-HI View of Shells and Loops in the Magellanic Bridge

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ID: 329648
2026
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Abstract
Abstract We present 8 pc-scale GASKAP-H i observations of an H i shell (diameter ~130 pc) associated with the Hα shell DEM171 in the Magellanic Bridge. The Bridge’s diffuse, H i-dominated environment, with minimal galactic shearing and fewer overlapping star-forming regions, provides an ideal environment to study cold gas formation driven by stellar feedback. To investigate the H i multi-phase structure and kinematics of the shell, we perform Gaussian decomposition of H i line profiles. We identify cold H i components with velocity dispersions σ < 2.5 km s−1 located within the shell. Complementary Herschel far-infrared (FIR) 250$\rm{$\umu $m}$ and Hα maps show that while the central cavity is ionized, the shell walls contain cold H i, molecular gas, and dust, suggesting that stellar feedback has promoted cold gas formation or swept pre-existing cold gas into the shell walls. We also identify cold H i clumps outside the shell tracing a larger-scale structure, MB-Loop I. To investigate the large-scale context, we apply a Fourier transform method to H i emission-line profiles to map the lower limit of cold-gas column densities across a section of the Bridge, revealing structures from large loops to smaller shells. The association between MB-Loop I and the H i shell suggests that cold H i gas may pre-exist before shell expansion. Finally, the shell exhibits asymmetric expansion, with a preferred orientation roughly perpendicular to the arc along MB-Loop I. Our results show that cold H i gas exists across a wide range of spatial scales in the Magellanic Bridge, highlighting the dynamic interplay that shapes the surrounding interstellar medium.
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Authors Shin-Jeong Kim, Antoine Marchal, N. M. McClure-Griffiths, J. R. Dawson, James Dempsey, Helga Dénes, John M. Dickey, Steven J. Gibson, Katie Jameson, I.J. Kemp, Bumhyun Lee, Min-Young Lee, Adam K. Leroy, Callum Lynn, Yik Ki Ma, Marc-Antoine Miville-Deschênes, E. Müller, Claire Murray, Hiep Nguyen, Nickolas Pingel, Hye-Jin Park, Jacco Th. van Loon
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1763
URL
https://doi.org/10.1093/mnras/stag1763
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