Unveiling polarized emission from interstellar dust of the Large Magellanic Cloud with Planck

Alina D. Bernard J.-Ph. Yuen K.H. Lazarian A. Hughes A. Iskakova M. Akimkhan A. Mukanova A.
1 January 2023 Oxford University Press

Monthly Notices of the Royal Astronomical Society
2023 #518 Issue 3 4466 - 4480 pp.

Polarization of interstellar dust emission is a powerful probe of dust properties and magnetic field structure. Yet studies of external galaxies are hampered by foreground dust contribution. The study aims at separating the polarized signal from the Large Magellanic Cloud (LMC) from that of the Milky Way (MW) to construct a wide-field, spatially complete map of dust polarization using the Planck 353 GHz data. To estimate the foreground polarization direction, we used velocity gradients in H I spectral line data and assessed the performance of the output by comparing to starlight extinction polarization. We estimate the foreground intensity using the dust-to-gas correlation and the average intensity around the LMC and we assume the foreground polarization to be uniform and equal to the average of the MW around the galaxy to derive foreground I, Q, and U parameters. After foreground removal, the geometry of the plane-of-the-sky magnetic field tends to follow the structure of the atomic gas. This is notably the case along the molecular ridges extending south and south-east of the 30 Doradus star-forming complex and along the more diffuse southern arm extending towards the Small Magellanic Cloud. There is also an alignment between the magnetic field and the outer arm in the western part. The median polarization fraction in the LMC is slightly lower than that observed for the MW as well as the anticorrelation between the polarization angle dispersion function and the polarization fraction. Overall, polarization fraction distribution is similar to that observed in the MW.

galaxies: general , Magellanic Clouds , magnetic fields

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Department of Physics, School of Sciences and Humanities, Nazarbayev University, Kabanbay batyr ave, 53, Nur-Sultan, 010000, Kazakhstan
IRAP, Université de Toulouse CNRS, UPS, CNES, Toulouse, F-31400, France
Department of Physics, University of Wisconsin-Madison, Madison, 53706, WI, United States
Centro de Investigación en Astronomía, Universidad Bernardo O’Higgins, General Gana 1760, Santiago, 8370993, Chile
Washington University in St Louis, One Brookings Drive, St. Louis, 63130, MO, United States
Nazarbayev Intellectual School, Khussein Ben Talal, 21, Nur-Sultan, 010000, Kazakhstan

Department of Physics
IRAP
Department of Physics
Centro de Investigación en Astronomía
Washington University in St Louis
Nazarbayev Intellectual School

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