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  The Galactic Faraday rotation sky 2020

Hutschenreuter, S., Anderson, C. S., Betti, S., Bower, G. C., Brown, J.-A., Brüggen, M., et al. (2022). The Galactic Faraday rotation sky 2020. Astronomy and Astrophysics, 657: A43. doi:10.1051/0004-6361/202140486.

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Hutschenreuter, S.1, Author           
Anderson, C. S., Author
Betti, S., Author
Bower, G. C., Author
Brown, J.-A., Author
Brüggen, M., Author
Carretti, E., Author
Clarke, T., Author
Clegg, A., Author
Costa, A., Author
Croft, S., Author
Eck, C. V., Author
Gaensler, B. M., Author
de Gasperin, F., Author
Haverkorn, M., Author
Heald, G., Author
Hull, C. L. H., Author
Inoue, M., Author
Johnston-Hollitt, M., Author
Kaczmarek, J., Author
Law, C., AuthorMa, Y. K., AuthorMacMahon, D., AuthorMao, S. A., AuthorRiseley, C., AuthorRoy, S., AuthorShanahan, R., AuthorShimwell, T., AuthorStil, J., AuthorSobey, C., AuthorO’Sullivan, S. P., AuthorTasse, C., AuthorVacca, V., AuthorVernstrom, T., AuthorWilliams, P. K. G., AuthorWright, M., AuthorEnßlin, T. A.2, Author            more..
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
2Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: Aims. This work provides an update to existing reconstructions of the Galactic Faraday rotation sky by processing almost all Faraday rotation data sets available at the end of the year 2020. Observations of extra-Galactic sources in recent years have further illuminated the previously underconstrained southern celestial sky, as well as parts of the inner disc of the Milky Way, along with other regions. This has culminated in an all-sky data set of 55 190 data points, thereby comprising a significant expansion on the 41 330 used in previous works. At the same time, this novelty makes an updated separation of the Galactic component a promising enterprise. The increased source density allows us to present our results in a resolution of about 1.3 × 10−2 deg2 (46.8 arcmin2), which is a twofold increase compared to previous works. Methods. As for previous Faraday rotation sky reconstructions, this work is based on information field theory, namely, a Bayesian inference scheme for field-like quantities that handles noisy and incomplete data. Results. In contrast to previous reconstructions, we find a significantly thinner and pronounced Galactic disc with small-scale structures exceeding values of several thousand rad m−2. The improvements can mainly be attributed to the new catalog of Faraday data, but are also supported by advances in correlation structure modeling within numerical information field theory. We also provide a detailed discussion on the statistical properties of the Faraday rotation sky and we investigate correlations with other data sets.

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Language(s): eng - English
 Dates: 2022-01-04
 Publication Status: Published online
 Pages: -
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 Identifiers: DOI: 10.1051/0004-6361/202140486
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 657 Sequence Number: A43 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1