| Download | - View final version: Magnetized H i superbubbles in the Small Magellanic Cloud revealed by the POSSUM pilot survey (PDF, 4.3 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1093/mnras/stae2245 |
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| Author | Search for: Jung, S LylaORCID identifier: https://orcid.org/0000-0001-5512-3735; Search for: Seta, AORCID identifier: https://orcid.org/0000-0001-9708-0286; Search for: Price, J MORCID identifier: https://orcid.org/0000-0001-7013-0562; Search for: McClure-Griffiths, N M; Search for: Livingston, J DORCID identifier: https://orcid.org/0000-0002-4090-8000; Search for: Gaensler, B M; Search for: Ma, Y KORCID identifier: https://orcid.org/0000-0003-0742-2006; Search for: Tahani, M; Search for: Anderson, C S; Search for: Federrath, C; Search for: Van Eck, C LORCID identifier: https://orcid.org/0000-0002-7641-9946; Search for: Leahy, DORCID identifier: https://orcid.org/0000-0002-4814-958X; Search for: O’Sullivan, S P; Search for: West, J1ORCID identifier: https://orcid.org/0000-0001-7722-8458; Search for: Heald, GORCID identifier: https://orcid.org/0000-0002-2155-6054; Search for: Akahori, TORCID identifier: https://orcid.org/0000-0001-9399-5331 |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Funder | Search for: Australian Government; Search for: Government of Western Australia; Search for: Science and Industry Endowment Fund; Search for: Australian Research Council; Search for: Natural Sciences and Engineering Research Council of Canada; Search for: Canada Foundation for Innovation; Search for: European Research Council; Search for: Canada Research Chairs; Search for: Kavli Institute for Particle Astrophysics and Cosmology |
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| Format | Text, Article |
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| Subject | polarization – techniques; polarimetric – ISM; bubbles – ISM; magnetic fields – Magellanic Clouds |
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| Abstract | Neutral hydrogen (H I) bubbles and shells are common in the interstellar medium (ISM). Studying their properties providesinsight into the characteristics of the local ISM as well as the galaxy in which the bubbles reside. We report the detection of magnetic fields associated with superbubbles in the nearby irregular galaxy, the Small Magellanic Cloud (SMC). Using the Polarisation Sky Survey of the Universe’s Magnetism (POSSUM) pilot survey, we obtain a high-density grid (≈ 25 sources deg⁻²) of Faraday rotation measure (RM) from polarized sources behind the SMC. This provides a sufficiently large number of RM measurements to study the magnetic properties of three of the largest H I shells previously identified in the SMC. The RM profiles as a function of distance from the shell centre show characteristic patterns at angular scales comparable to the shell size. We demonstrate that this can be explained by magnetohydrodynamic simulation models of bubbles expanding in magnetized environments. From the observations, we estimate the line-of-sight magnetic field strength at the edges of the shells is enhanced by ∼ 1μG with respect to their centres. This is an order of magnitude larger than the field strength in the ambient medium (∼ 0.1μG) estimated based on the expansion velocity of the shells. This paper highlights the power of densely mapped RM grids in studying the magnetic properties of galactic substructures beyond the Milky Way. |
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| Publication date | 2024-09-27 |
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| Publisher | Oxford University Press |
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| Licence | |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 986af07f-c042-4d90-8039-01f57cffc1fd |
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| Record created | 2025-03-26 |
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| Record modified | 2025-03-26 |
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